Purple is easily Utsugi, orange is most likely Sawa due to the warning nature, and I'm guessing red is Oono as I perceive her to be more of the straight-man type.
Karina, get up, we have to spread out the futons!*SNORE*~...
*SIGH*...Ooh~, how bold, Karina-chan~♥Your panties are in full view!