Broken Bird: In the game, her past in orphanage was one of the harshest from Fragments. Actually her power which was actually the Phantasmagoria of Liselotte herself made orphans kill between themselves (except Kukuri, herself and Kakeru) These memories traumatized her and when she saw later Kakeru becoming closer to others girls, she began to worry, then used her power to keep Kakeru for herself. In the game, her actions become at least understandable.
False Friend: In the anime. She seemed to care about the others at the beginning, but later she didn't give a damn about the others' deaths, didn't try to stop Takahisa when he became angry, and even let Yukiko be killed by the Black Knights. However, in the game, she still truly cares for them.
Freudian Excuse: She is absolutely unforgivable in the anime for everything she did. Nevertheless in the game, her backstory is one of saddest ones as her power killed every orphan except Kakeru and Kukuri. That's why she is so clingy and would do extreme things to keep Kakeru for herself.
First Name Basis: Gets worried when Kakeru calls Misuzu by her first name in the anime.
Good Is Not Nice: In the anime, HELL YES even if she appeared kind and sweet at the beginning. It's subverted in the game.
Kick the Dog: In the anime when she tried to kill Misuzu. Before that, there is also the scene in episode 9 where Shiori said to her she wasn't sure that the others would survive the Black Knights. Yuka just answered that it wasn't a problem as long as Kakeru survived. Ow...Yuka.
Driven to Suicide: Kakeru's sister in the very beginning. Turns out there are parallel worlds, and in at least two of them, Kakeru's sister, Kukuri, knew about Liselotte's plan, which needed Kakeru's golden eye to succeed. So in one world, she had the spirit of Abraxas, which had a chain whip attack, which she used to kill him, then herself. But that world didn't have the golden eye, and instead the Kakeru in Yuka's universe/world had it, while Abraxas didn't exist in that version of Kukuri. So instead of killing both of them, Kukuri in Yuka's world only killed herself since she lacked the chain-whip attack of Abraxas. Yeah, it's kind of confusing.
Healing Factor: Yukiko shrugs off some pretty serious damage during the course of events. That she was a child soldier who had this ability exploited really reveals what she's gone through.
I Am a Monster: She thinks she's nothing but a ruthless killer. If her route wasn't picked, this was also the reason why she rejected Takahisa's love for her. He eventually makes her feel better and she soon reciprocates his feelings.
Yaoi Fangirl: In one of the promotional videos of 11eyes Resona Forma, she sounded too excited when she thought Takahisa has feelings for Kakeru. She even suggested to Takahisa that he should ask Kakeru out.
Abusive Parent: His father sexually abused his younger sister Ema. Their mother seemed caring in Takahisa's After Story but it implied that she did nothing to protect them in the past, which is probably the reason why Takahisa was so cold toward her during their meeting.
I Want My Beloved to Be Happy: If the player chooses Yukiko's route, he confesses to Yukiko, like all in the other routes, but he wants Yukiko to be happy with Kakeru, knowing that he's the one she loves.
Loveable Sex Maniac: When he and Yukiko got together, he immediately asked for sex. He ended up getting chased around by her.
In Takahisa's Route of Resona Forma , Takahisa finally slept with Yukiko. Then in the morning, he asked for more.
Also in the drama cd, he said "Tomo To Erosu No Tame ni" which means 'For the sake of Eros and tomorrow.'
Heroic Neutral: At the beginning, she ended up by becoming a true allies of the protagonists.
Heroic Sacrifice: She sacrificied herself to give her fragments to Kakeru. Fortunately just in the anime...
Don't forget in Resona forma, she lied in her report to protect her friends's identity from Johanna and Church Council. Except in her route, it's implied she didn't survive in others routes as her love for Kakeru was the only thing which made Johanna change her heart toward her. Furthermore along with Kukuri, she is the only character who didn't appear in others routes.
And a bit with Fu Manchu the Thule Member in Before Story.
Greyand Gray Morality: While he isn't really the Big Bad and just wants to prevent the world to be destroyed he is really willing to kill some innocent children.
Furthermore, he has a curious way to accomplish his mission as even if he saves the world, he sacrifices his comrades as well as the woman he loves. Nevertheless, this last thing could be forgiven as he couldn't probably expect it.
Even Evil Has Loved Ones: It's unknown if he loved Irene. However, he showed some sympathy for his others comrades, and expressed anger when Gula and Acedia died. Subverted in the manga and in the anime.
Heroic Sacrifice: Subverted in Before Story. However, it's a Stupid Sacrifice which leads to his death.
Mercy Kill: He asked it to Irene in Before Story in order to kill Liselotte too.
Not So Stoic: in his last moments in Before Story as Sebastianus. He smiled to Elaine sincerely before dying.
Pet the Dog: he is still one of the most violent in the game. However, he seems to have a certain care for his comrades as he is angered when Gula and Acedia are killed. Furthermore, Invidia's love toward him shows he isn't completely bad. subverted in the anime.
Ironically, he also somehow gives one to themselves (Black knights) in the original game:
Ira: "Who we really are, you ask? There is no one more pathetic than we, who have abandoned our human flesh. In the end, all of us only exist to fight till death in this pitiful hell; talking to a sinner who is about to become a corpse right here won't gain me anything. However... just for this once I shall reveal the name of your killer. My name of bane is Ira. Engrave that into your heart for eternity!!"
Pet the Dog: Although the scene where he's showed made thinking more of a Kick the Dog in the way he treats her, he loves his sister and it seems she is one the few people, even probably the only one who he cares about. Then, as Samson also tries to become closer to him, he could be not completely bad.
She nearly used every apostles's wishes and love to kill them, as humiliating both Samson and Benedictus, the former by calling his one-sided love for Misao a sin burning him in the process, the latter by Rape By Proxy with his own sister.
Don't forget even if Scholastica was about to disappear by herself she made a horrible trick with her by using Misao's illusion calling her origami a trash while Misao was the one Scholastica cared and trusted the most.
Furthermore she even killed Elaine while this latter was pregnant
Pet the Dog: with Verard which is her only human quality.
Villainous Friendship: She apparently this with the other Thule member Kanae in type III, as she doesn't care for her while this latter admired her. She also a Type IV friendship with Fu Manchu and probably Walter.