mama didn't like Kahei. she had liked her once and then, one day, she didn't. mamas kisses turned into punches. mama called kahei bad words. baba tried to protect kahei. he told her that mama didn't like that she was different. baba would protect her, he said. but he disappeared one day when mama had red colored hands. the hits got worse. mama wouldn't even let her go outside. the neighbors got worried from all the screaming. they called men in suits on them. mama held kahei with something sharp against , telling the men in suits to go away. kahei heard a loud boom and then she was all red, too. the suited men took her to a nice place with a kind lady who took care of her. she called her nice names and said that she was her mama now. but mama was no good, kahei thought. mama hurt her! so she made her new mama all red, too. the men in suits came back and took her to another nice place. they called it the dome. the people there weren't nice. kahei tried to make them all red but got hurt for it. so she tried to make herself all red instead. she threw herself into walls and slapped and punched her face until she was purple and blue. but all it caused was hurt. hurt, hurt, hurt. 

so one day she stopped. she went quiet and began to keep to herself. she began to smile, and she started trying to make others smile, too. after a year you could barely tell that kahei was once a violent little girl. she changed her name to a nickname a nice old man gave her, vivi. she wasn't wong kahei anymore, the little girl full of rage and sadness. she was vivi, a girl who wanted to give and get love. and she was happy. happy happy happy happy happy.

 

tl;dr: kahei was born with some sort of mental disorder. her mother, distraught at having a messed up daughter, became abusive. her father tried to protect her but ended up being killed by her mother and the abuse continued. neighbors got suspicious and called the police to the home where kahei's mother held her with a knife to , threatening anyone who came close. the police shot her mother in the head and killed her. kahei was then put into a foster home, but she herself killed the woman taking care of her when she called herself kahei's mama. she was only 11. she was taken to the dome and continued her violent, angry ways. one day, however, when she was 16 she snapped, and became calm and good. nobody knows exactly what happened, but it was like all of her anger flew out the window. she renamed herself vivi after another domer nicknamed her so. while vivi is now extremely sweet and innocent, certain topics and things can bring her to a manic frenzied state where she is not afraid to hurt others or herself. its best to keep her happy, and even better to not ever mention her mama.