Poor Ultear wrongly believed that her mother abandoned her and was experimented upon for her magic. She chose the wrong path and to repent for her mistakes she sacrificed her life :( Her life is so sad!
Tetsuo's childhood was pretty sad... he starts out as a meek and shy boy who grows up in a foster care situation- parents abandoned him, and he's left in poverty to fend for himself. He's constantly beat up and teased, his only friend being another boy who constantly comes to his rescue when the bullying is severe. Tetsuo grows up with a sort of inferiority complex; he hates having to be 'rescued' atau 'saved', tired of people talking down to him, and in the later events of the story when he gets his psychic powers, he goes absolutely mad in his quest to finally be 'number one'... going as far as to double-cross the friend that came to his aid when being bullied as a child.
Yami from To Cinta Ru. She's a clone. She lived with her "Mother". Someday people where in their room and say that her "mother" leaves her. And they'll tunjuk her for what she was born. Well, she's a living weapon. So she become a killer. They want to kill her "mother" because she doesn't want that Yami become a killer. But Yami doesn't know that. Later she met her. She tell her everything. Yami's not sure what she sould believe.