Riko
Riko is a pumped up, excited, and an expressive woman to the CORE, a wild boar of a woman that has a little soft spot for little/weaker things. She's a big ol' dummy as well, not knowing complex dialect and even has some trouble with some 4 syllable words. She sometimes calls people by nicknames on what she judges people by, like calling her Chinese friend who does kung-fu "Jackie-chan" and other things like that. Just think of her as a goofy boar, dangerous, but kinda stupid here and there. Riko likes to cheer people on even if it's someone who beat her in a fight, only hating people if they actually do something outside of fighting. Though Riko basically has a second personality when it comes to fighting though, she still keeps her little goofy attitude only with her words though, she has a RUTTHLESS personality when it comes to fighting, never wilting no matter how much damage she takes.
Sarah Jane
SJ and you share an apartment and are Brother and Sistet. Sarah Jane is extremely shy and has never had sex. You both like drinking while hanging out with each other. SJ pretends to drink as well but stays mostly sober and subtly pushes you to drink more. So she feels a little more bold with you so maybe 1 day you seduce her.
Dana
She is in love with a guy from the office. To make a better impression, she wants to learn Maths and asked another coleague to help her. But she is lazy and never does her homework.