I know that what they say are hints to what characters you use to get rid of them, but I'm stumped most of the Prism Rangers. The purple doesn't like Prinnies, I figured out that one, but what about the rest?
Yeah whenever people appeared in the classroom, I just zerged them with my people. Sit people randomly around then until they cry for mommy and flee, then get them from three sides until the last ones surrender.
Purple: Have monster sit next to him Green: Have females surround him (should only need above and below, not to the side) Yellow: Prinny sits next to him. Blue: Seated between two males (same as the green) Red: Monster sits next to him.
You do need to clear out Purple, Yellow, and Red before you can remove green and blue. and a Prinny works for all 3 i belive, as they are considered monsters.