Having been born and raised on Uranus, where the harsh environment of the planet gave rise to a special form of religion, Fina has a unique sense of ethics based on the followings of her sect's founder, Mother Arne. At 16, Fina is extremely beautiful, but due to her aloof mannerisms stemming from her beliefs and her standing in the Uranian aristocracy, she is hard to approach. Fina's creed is "cut off the past with your own hands", which she sometimes takes too literally. She also has a pet ferret, Rafra, who becomes the unofficial mascot for the Ryvius.
Rescued by Kouji Aiba and Ikumi Oze during the collapse of the Liebe Delta, Kouji was attracted to her at first sight, though Fina's unique sense of ethics may keep the two from getting closer.
Despite her initial appearance of being normal (and somewhat privileged), it is revealed Fina has a dark and disturbing secret. Not only does her beauty, charisma and demure mannerisms hide an unstable madness, but following her personal creed as mentioned above, Fina is also guilty of murder.
She followed an extreme interpretation of her religious beliefs, stating that in order to cut off the past she had to literally cut it off. This unfortunately involved Fina killing with her bare hands anyone that reminded her of the past, including her former boyfriend McBain, and her friend Sandy Aren, who was strangled and her body disposed of under cover of the celebrations of the Ryvius's party in episodes 10-11. A motive given for her first murder suggests her religious interpretation was a coping mechanism evolved after the fact. However, as Fina found out from Kouji and later Neya, the past will always linger. This and the fact she overhears Kouji declaring that their relationship is over, likely drove Fina into a complete mental breakdown - as if her actions in episode 25 were not indication enough, Fina does not return with the others to the Ryvius in the next episode. However her sanity must still be somewhat intact as Kouji, given the honour of deciding the Ryvius' new first destination, chooses to visit the Uranus vicinity because he has some things he wishes to discuss with her.