Who's the babe on the right?

Her name is "Sera" or "Serra" thats all I know, shes just a bunny who works in the casino if I had to guess

Actually, Sara's a Princess. Princess Sara, Sara-hime or for Japanese searches try "セーラ姫, or セーラ パチスロ". She comes from the Jujika pachislot series. In these slot games, she's held captive in Dracula's Castle and the goal is to rescue her from Dracula.