"Life is hard when you don’t know who you are. It’s harder when you don’t know what you are. My love carries a death sentence. I was lost for years. Searching while hiding. Only to find that I belong to a world hidden from humans. I won’t hide anymore. I will live the life I choose."
– Bo monologue during episode begin credits.
Bo is a bisexual Succubus  raised by human parents who adopted her as an infant. During her first sexual experience, she involuntarily killed her high school boyfriend by draining him of his Chi (life energy). Not knowing what she had done and why it had happened, Bo ran away from home, living a life without friends or family, and moving from place to place, changing identities each time she killed again. It was not until she was discovered by the Fae, and helped by the Light Fae's human physician and scientist, that she finally learned what she was and how to control her chi-draining powers.
Not much is known about Bo's early life except that she was given up as an infant by her birth mother, Aife, so that she would not be kept by her evil father, a Dark King. She lived with her adoptive human parents as "Beth Dennis" and grew up in Grimley believing she was human. Her deeply religious conservative parents often took her to church and taught her that sex was evil. Despite her upbringing, she was unable to control her urges and at the age of eighteen she unintentionally killed her boyfriend, Kyle Williams, during her first sexual experience. Scared and confused, she turned to her parents for their succor, who then revealed that she was adopted. They informed Bo that they knew nothing of her origins and the only trace of her past was a baby photo of her with the name "Bo" written on the back. Angry, she ran away from home, creating different identifications in order to escape detection, fearing she was being sought for Kyle's murder.
In the show's first episode Bo is seen working as a bartender at a hotel bar. This is where she first meets Kenzi, who is there pick-pocketing its clients. An aggressive male patron targets Kenzi and slips a date-rape drug into her drink and then follows her to the elevator. Bo, who saw what he had done and knew what he was up to, followed them, and in order to save Kenzi she chi-drained and killed him. When the body is later discovered, both Dyson and Hale (Light Fae working as detectives in the human police force) surmise that the man was killed by a Fae and investigate further. When they realize Bo is the assailant, they abduct her and take her to the Fae Elders for interrogation.
Bo is examined by Lauren, the Light Fae's human doctor and scientist, who is able to deduce that Bo is a Succubus. Bo is confused but happy to find out that she is not abnormal and that there are others like her. Lauren informs Bo that with help she can learn to control her powers and no longer unwittingly kill someone in order to feed, which greatly relieves Bo.
Bo is forced by the Fae to prove herself in a "trial by combat", after which she is given the choice to align herself with either the Light or Dark Fae clan. Bo refuses to join either side, proclaiming "I choose humans!" after Kenzi had risked her own life to find out what had happened to Bo and try to help her. Although the two Fae leaders of the local territory, The Ash and The Morrígan, were uncertain about Bo's decision to remain neutral, Trick convinced them to accept it in order to find out who had been responsible for concealing her existence for so many years. With Kenzi as her sidekick, Bo established herself as a private investigator for Fae and human clients, her neutral status allowing her to interact with Light Fae and Dark Fae for information, even if she is not protected against attacks by either clan.
In Turn to Stone, Bo is informed by The Keeper of The Una Mens that her blood is Dark Fae. However, in Waves, we learn that Bo deliberately aligned herself with the Dark by creating the Succubus Declaration herself and having Rainer witness her signature, appearing as her sponsor. Bo knew she would lose her memory of her month on the Death Train when she left it, and set up a series of clues to find her way back to the train and Rainer.
In End Of A Line, Rainer's face suddenly materialized in a blank page of a book at The Clubhouse and when Tamsin asked Bo who it was, a surprised Bo told her it was Rainer, the one who had hired Tamsin to find Bo; however, Tamsin informed Bo that the face was not that of "her boss" – which meant that Rainer was not The Wanderer.
While searching for information about Rainer in the Book of Fae History, Lauren found the image of The Wanderer in it. She read the prophecy to Bo and showed her the image, and though it bore a resemblance to Rainer, Bo refused to heed Lauren's warning about her involvement with him. Afterwards, Rosette (the Knight) told Bo and Rainer that if by the seventh day of Rainer leaving the Death Train the two are not united as each other's spouse, he would die. To save his life and, she thought, for what was right for her family and good of the Fae, Bo went through with the handfasting ceremony. However, their becoming united was a trick by the Rosette that made it possible for the portal to Hel to be opened and release the Lord of Darkness. (Origin/It Begins)
In Dark Horse, Bo concluded that she is, in effect, a hybrid after she asked Trick to tell her everything he knew about her blood. Trick explained to Bo that she had inherited the "blood of a Mage" that drains life for nourishment and self-survival from her Light Fae mother, Aife – but the blood of her still-unknown Dark Fae father allows Bo to draw the life force from many victims and transfer all of it to someone else other than herself.
Bo has one foot in each of two worlds: the Fae and the Human.
Bo is fiercely independent and chooses not to subjugate herself to either the Light Fae or Dark Fae, and frequently disregards the rules of the Fae world in order to do things her own way. Despite being independent, she has shown great loyalty to her friends, frequently risking her life to help them.
Having suffered verbal and religious conservative abuse from her adoptive parents, Bo had a great deal of resentment and guilt towards them. Before making peace with her adoptive mother, Mary, she confessed that her mother's cruel words about her being "a monster" – after Bo sought her help and support when she caused Kyle's death – often echoed inside her head.
Because she grew up among humans, Bo does not regard them as inferior beings as most other Fae do, and prefers to live among them while still keeping her true nature hidden.
Due to her succubus species Bo is an extremely sexual being, not only needing sex to feed and survive but also to heal. Since learning how to control her chi-drawing powers, Bo has been able to enjoy sex freely without fear of killing a sexual partner.
Despite being a succubus, Bo has expressed her desire for a monogamous relationship. She has deep romantic feelings for both Dyson and Lauren, and goes on to explore personal relationships with each of them at different times. In the third season, Bo asked Lauren to be with her in a monogamous relationship and although she tried to be physically faithful, her need to feed could not sustain it. Being with Lauren, however, was the first time Bo said "I love you" to anyone.
In Faes Wide Shut, Bo's dark side took control of her when Lauren and Kenzi's life were threatened, attacking those responsible in a violent and powerfully aggressive rampage. She needed Lauren to stand up to her and coax her back to normal. After passing The Dawning, Bo's powers have increased.
- Kenzi: Bo's best friend and sidekick. They live together in an abandoned old house nicknamed The Clubhouse. They are partners in a private investigation business. Their relationship can best be described as a very close sisterly bond. Bo has described Kenzi as smart, honest, kind, and makes Bo feel normal and special. Kenzi is Bo's heart. After Kenzi sacrificed herself to save Bo from death, Bo was devastated and will stop at nothing to bring Kenzi back from the afterlife.
- Dyson: Bo's relationship with Dyson is both intense and complicated. Because Dyson is Fae, Bo is able to feed off him without causing much harm. They initially had an arrangement in which Dyson let Bo chi-feed from him and heal from the sexual energy created between them. This caused them to develop feelings for each other and they fell in love.
- In Vexed, he stopped Bo from killing Vex, a Dark Fae Mesmer, because, as he said, "If you kill him they won’t stop until you’re dead." In the finale episode of Season 1, Dyson offered his wolf to The Norn so that Bo could have his strength when she battled Aife, but The Norn tricked him and took his love for Bo and his ability to love anyone else. Bo broke up with Dyson when she discovered that he had lied to her about knowing who her birth mother was and that he had been Trick's secret agent assigned to keep her under watch. In Into the Dark, Kenzi forced The Norn to give her the vial containing Dyson's love essence and his love for Bo was restored, but he did not tell Bo. During Season 2 and Season 3 the two are exclusively friends; however, during Bo's Dawning passage inside The Temple, Dyson finally confessed to Bo that he loved her, but would not interfere with her relationship with Lauren, and would wait for her.
- Lauren: is a human doctor and scientist, and the property of The Ash (leader of the Light Fae). In the first episode of the series, Lauren examined Bo and was able to determine that she was a succubus, and offered to help Bo learn how to control her chi and sexual energy drawing so that she could feed or heal without hurting or killing anyone. They became friends, with an obvious sexual and romantic attraction between them.
- However, Bo did not act on her attraction for fear that she would hurt Lauren. Bo finally gave in when Lauren seduced her in Vexed, after The Ash commanded Lauren to find a way to distract "the succubus" so that Bo could be delayed from finding out about Vex and prevent her from confronting him. If Bo were to injure or kill Vex it would have created a volatile problem between the Light and Dark Fae, and provided The Morrígan with a reason to execute Bo. After Lauren admitted to Bo that she had been ordered by The Ash to distract her, Bo felt betrayed and relations between them became tense; and although Lauren tried several times to explain her reasons to Bo, she would not listen. After the suicide attack in Blood Lines that killed many Light Fae Elders and critically injured The Ash, Lauren helped Bo recover the Koushang which would help her when she confronted Aife. Bo promised to make amends with Lauren after the fight and they shared a kiss before Bo left. Their friendship was restored in Season 2, but experienced many obstacles after the new Ash, Lachlan, restricted most of the personal freedom Lauren had been allowed by the previous Ash. In BrotherFae of the Wolves, Lauren sought sanctuary in Bo's home and their romantic relationship was rekindled in It's Better to Burn Out Than Fae Away. Bo then discovered that Lauren had a girlfriend, Nadia, that had been lying in a comatose state for five years and for which finding a cure was the reason Lauren had pledged herself as a servant to The Ash.
- Lauren found out from Lachlan that the previous Ash had a Dark Shaman curse Nadia into a coma so that he could retain Lauren as his scientist and physician human property. Bo and Lauren maintained a close relationship until Bo released Nadia from the curse and they shifted into being "very good friends". After Bo was forced to kill Nadia when she threatened Lauren's life, the romantic relationship that had existed between them was gradually reinvigorated. In Season 3, Bo asked Lauren to be with her in a real relationship together and their union was the first time Bo said "I love you" to anyone. Bo initially tried to be sexually monogamous, but it caused problems for her succubus feeding needs. Lauren understood Bo's nature and told her she could feed from others, except for Dyson (because he was her ex-lover). However, after Tamsin tells Lauren in Delinquents that she and Bo had kissed without it having involved feeding (unaware that the kiss was the result of Trick and Stella touching the Dawning Invitation Machine at the same time they first kissed in Fae-ge Against The Machine), Lauren felt hurt and discouraged, and not able to give Bo what she needed. Afterwards, Lauren then told Bo that she wanted a "break" from the relationship because she was not happy and felt like she was losing herself. Bo eventually became concerned that their separation might not be temporary. In Turn to Stone, while looking around in Lauren's apartment, Bo found the folder with the wanted poster showing Karen Beattie as Lauren's real name.
- Bo and Lauren are reunited in Let the Dark Times Roll. They kissed passionately, happy to see each other again; delighting in their reunion, they made love hastily. Bo shocked Lauren when she told her that her blood had chosen the Dark Fae and she was no longer unaligned. Lauren, in turn, shocked Bo by informing her that she was now working with the Dark after The Morrígan offered protection and freedom without a binding agreement. When Bo told Lauren she could both protect and free her by claiming her, Lauren rejected being owned by Bo and chose to stay with the Dark instead, and said to her, "You’re Fae. I'm human. So I'll always be a prisoner. The least I can do is choose my own cage." Bo walked away stunned.
- Trick: is one of Bo's most trusted friends and mentor in regards to the Fae world. In Into the Dark, it is revealed that he is Bo's maternal grandfather and Aife's father. He was The Blood King that used his Blood Sage powers to write the peace truce ending The Great War between the Light and Fae clans, and created the Blood Laws that thereafter governed the Fae world.
- Aife: is Bo's birth mother whom Bo met in Season 1. At first Aife posed as Saskia, a succubus who wanted to educate Bo on the ways of her species. When Bo discovered that Aife was her mother, she was willing to speak to her and learn about her, even after she kidnapped Bo. After Bo realized that Aife was evil, the two fought in hand-to-hand combat. Bo won the fight after Trick used his Blood Sage powers to revive Aife's maternal bond, and stop her from hurting and killing Bo; while Dyson simultaneously supplicated The Norn to transfer his wolf strength to Bo. Aife let herself fall from the top of a staircase and her body was seen being carried away by an unidentified man. In Season 2, Aife's whereabouts were unknown. In Season 3, she resurfaced as a Fae specimen confined within a glass cell inside Dr. Isaac Taft's laboratory, along with Dyson.
- Ryan Lambert: is a Dark Fae Loki with whom Bo had an on-going sexual relationship in Season 2. Ryan and Bo's hedonistic relationship thrived on the fact that neither of them was interested in an emotional, committed relationship. Bo also used him to heal and he was willing to let her feed from him. After Kenzi discovered that Ryan was Dark Fae, Kenzi told Bo to end the relationship. Bo lied to Kenzi and continued the relationship behind her back. However, they both ended it after nearly marrying each other as a result of her accidentally enthralling him with her blood, which coincided with her being struck by a Fae-induced amnesia (Fae-nted Love).
- Rainer: is the rebel warrior whose soul was cursed by The Blood King to ride for eternity on the Death Train of damned souls. Bo met him when she was transported to the Death Train at the end of Those Who Wander. She believed he was her destiny and became lovers with him. They were tricked by Rosette into believing they needed to become united in a handfasting ceremony so that he would not die by the seventh day of his departure from the train. Their union caused the portal to Hel to be opened and release the Lord of Darkness. He is killed by Massimo.
- Dark King: is the title by which Bo's Dark Fae biological father is known. He is a powerful and evil king that held Aife prisoner for centuries, during which time she gave birth to Bo in his prison. Bo has referred to him as a "monster" and has feared that she, too, could be a monster because of him. His name, status, species, and powers have not yet been established.
Powers and abilities
Several times through the first season she was referred to as being untrained, but displayed exceptional intuitive skills; and she has become stronger as she learns more about herself. Her powers include:
- Suctioning the chi (life force) from someone during a kiss. (Her eyes turn a luminous blue when this occurs.)
- Accelerated healing by "feeding" through kissing or absorbing the energy created from having sex.
- Draining several beings at once. This happened for the first time in Death Didn't Become Him when Lauren's life was threatened by The Lich, revealing a Dark Bo alter ego when anger and desperation ignited her rage. Her entire body glowed and her voice changed, becoming very deep and resounding. While in this state she hinted at another, stronger ability by proclaiming that she could be the most powerful Fae of all:
- "I can be more powerful than all other Fae. Everyone will kneel at my feet. There will be no more Dark and no more Light. There will be only me."
- Upon which she chi-drained everyone in the room except Lauren, broke the collar and chain that held her, and thereafter lost consciousness. When she revived, she could not remember what had just happened. She also appeared to be stronger and faster than the already high level she had been.
- Replenishing a person's chi. Control of this power was limited at first, but since The Dawning she can also revive a dead person by transferring the combined chi of several life forces into them (this power to resurrect must be done quickly before too much time has passed or it will not succeed). In Dark Horse, Trick explained to Bo that she had inherited the "blood of a Mage" that drains life for nourishment and self-survival from her Light Fae mother, Aife – but the blood of her still-unknown Dark Fae father allows Bo to draw the life force from many victims and transfer all of it to someone else other than herself.
- Controlling a person by temporarily enthralling them with her touch – this ability only works if the person would be receptive to Bo's sexual advances (she had no effect on a Gay male security guard in Food for Thought).
- Seeing the level of lust a person feels by looking at their aura.
- Showing intuitive proficiency with various weapons.
- Stronger and faster than average human. This increases and decreases based on the last time she fed and what she recently fed on. Feeding on humans satiates and keeps her 'engine' running, but she has been shown to become more powerful after feeding on Fae.
As the granddaughter of The Blood King:
- Enthralling someone with her blood (Fae-nted Love).
- In Into the Dark, Trick tells Bo that just like her mother, Aife, her blood has "the power to enslave others, to bind them to your will.”
As well as her succubus powers, her unaligned Fae status gives her some advantages in Fae society:
- She can freely associate with both Light Fae and Dark Fae (such as entering the territory of either clan without provoking conflict).
- Can use her powers on occasions where both the Light and Dark cannot due to adherence to ancient laws.
Her neutral, non-clan affiliation leaves her more vulnerable to being eliminated by assassins if she makes enemies within either clan. However, in Season 4 the benefits of being unaligned were jeopardized when The Una Mens proclaimed that her blood had chosen a side and she was Dark Fae.
- "It's not just my past. It's my present. For a long time I’d forgotten what I am to humans...a monster." – to Lauren (Raging Fae)
- "You take my breath away...breathless...completely." – to Lauren (Into the Dark)
- "It's not my heart I'm worried about. I love you...all...so much." – to Lauren (Flesh and Blood)
- "My father was most certainly dark, but what if he was a monster? What does that make me?" – to Trick (Caged Fae)
- "You bitches are witches." – to Carolyn and Susan (Adventures in Fae-bysitting)
- "I'm scared of making the wrong choice. Of losing my friends, my family again. I'm terrified of what I'll become. I'm terrified of what I'm capable of. I'm terrified of The Wanderer and what he'll make me." – to Krampus (Groundhog Fae)
- "I can be more powerful than all other Fae. Everyone will kneel at my feet. There will be no more Dark and no more Light. There will be only me." (Death Didn't Become Him)
- "My strength is unmatched. I shall reign as queen and you shall all tremble before my power." (Flesh and Blood)
- "I will reign as he did. For I am his daughter. Together we will bridle the masses and ride them to victory. Even death will fear us. Only I will choose who lives." (The Ceremony)
- The romantic relationship between Bo and Lauren is sometimes referred to as Team Lauren or Doccubus – the romantic relationship with Dyson is referred to as Team Dyson.
- Bo finds out in Flesh and Blood that she was named after her grandmother Isabeau, Trick's late wife.
- Although she is named after her maternal grandmother, Isabeau, her name is spelled with a "Y": "'Ysabeau', or Bo for short, was born of Fae and is a rarity in their world." – Lost Girl: Prologue.
- Bo has a birthmark on her left foot above the heel.
- When Lauren reveals her past to Crystal in Turn to Stone, we also become aware that Bo's background shares some similarities with Lauren's:
- (1) both committed a crime at about the same age: Bo killed her boyfriend when she was 18 years old – Lauren made a pipe bomb that killed 11 people when she was 17 or 18 years old;
- (2) both go on the run after the crime and assume false identities;
- (3) both hate themselves for what they had done: Bo for killing her boyfriend and sexual lovers since – Lauren for being the reason behind the deaths of 11 persons;
- (4) both had led secret lives;
- (5) both kept running and hiding until: Bo is discovered by the Fae – Lauren is discovered by The Ash in the Congo.
- In Destiny’s Child, we learn that Rainer is The Wanderer, but he is not Bo's father and, therefore, not The Dark King. However, in Waves, Rainer tells Bo that he was not the one who had her captured in black smoke and transported to the Death Train. In End Of A Line, when Rainer's face materializes on a blank page of a book of Fae portraits and Bo tells Tamsin that it's the face of her "boss" (meaning The Wanderer), Tamsin informs Bo that the face in the book is not him. Who Bo's father is, is still a mystery.
- The term Lord of Darkness was used for the first time in Origin/It Begins, the twelfth episode of Season 4. It has not yet been made absolutely clear that he is also the Dark King referred to in Season 1 and Season 2.
Bo (Anna Silk)
Bo is a Succubus, a powerful female entity in folklore who feeds off sexual energy. Raised by human parents, Bo had no reason to believe she was anything other than the girl next door - until she “drained” her first boyfriend to death. Bo then discovers that she is one of the Fae, creatures of legend that pass as humans while secretly feeding off them. Faced with choosing between an allegiance to the Dark or Light Fae clans, Bo takes the middle path between the human and Fae worlds, while embarking on a mission to unlock the secrets of her origin. Her succubus nature tangles her in an intense and evolving love triangle with Dyson, a shape-shifting Fae and homicide detective, and Lauren, a human doctor who has found a way, through science, to help give Bo the sexual self control she’s been aching for. Navigating this complicated life with Bo is her street-smart “bestie” and partner in crime, Kenzi.
- ↑ "That’s our Bo Dennis: serving + protecting fae/humans alike." - Syfy PR @SyfyPR (Twitter), 18 March 2013. Retrieved on 08-07-2013.
- ↑ "An Interview with Michelle Lovretta. (The Watercooler. 2011)" - "When Prodigy (our studio) asked me to create a show about some kind of bisexual superhero who uses sex as part of her arsenal, my first thought was 'hell, yes!'" - Michelle Lovretta, creator of Lost Girl. Retrieved on 09-01-2013.
- ↑ "Nine Questions with Lost Girl Creator and Writer Michelle Lovretta. (RGB Filter. September 30, 2010)" - "Bo is a succubus, a grown woman, and bisexual...." - Michelle Lovretta, creator of Lost Girl. Retrieved on 09-01-2013.
- ↑ "Lost Girl's Comic Book: Prologue (Page 7)" - Prodigy Pictures/Showcase, 2011. Retrieved on 09/20/2013.