Camille "Cami" O'Connell is a vampire and a main characteron The Originals. She is a psychology student who moved to New Orleans to investigate the death of her twin brother, Sean O'Connell. Initially, both Klaus and Marcel were attracted to her apparent physical beauty and intelligence, and thus they attempted to keep her sheltered from the major ongoing conflict between the vampires, witches and werewolves of the city. However, she eventually became aware of the surrounding supernatural world and, shortly after, uncovered the truth about Sean's death, making it impossible for them to keep her in ignorance any longer.
Over time, she became increasingly involved with the Mikaelson family, partly due to her uncle's role as de facto leader of thehumans in New Orleans, and partly due to her growing relationship with Klaus. This relationship, combined with the fact that she was human, placed her in sights of the family's vengeful enemies, who started noticing the important role that she seemed to play in Klaus' life and therefore saw her as an asset against him. This endangering situation culminated in her slitting her own throat under compulsion and subsequently turning into a vampire; this deadly scheme was set in motion by Klaus' former lover Aurora de Martel, who wanted to get back at him for leaving her and for torturing her and her brother, and who also expressed jealousy towards Cami, seeing her as her own 'replacement' as Klaus' new love interest.After becoming a vampire, Camille's personality drastically changed: she became seemingly more confident and determined, but also more reckless and careless. As she suspected herself to have a 'darker side' as a human, this sudden shift in personality and behavior associated to her new vampirism can be seen as a self-fulfilling prophecy.