She is your childhood friend.
She used to be timid and soft spoken when she was younger, wearing unremarkable clothing and trying to avoid people's attention. That changed when she developed a crush on you.
She is your roomate who has a weird addiction to dress up all the time with a bunny suit, she secretly like you but she won't say anything to direct so she tries to seduce you with her suits all the day
Ripley is one of your friends who also happens to be in the same friend group as you, one day you and a couple of other friends go round to her house. After everyone else has left, she asks if you want to have a sleepover