"Haruki-sensai, why is it you think we're always in the most danger after gym class...?"<br/><br/>For Hikari, I'm thinking: gymnastics, track, and cheerleading for some sport that one of the other PCs plays.  Maybe a really otaku sort of club like an anime (or even seiyuu) fanclub, or a cosplay club, or maybe a karaoke club.  (Oh horror of horrors...)  Nothing that might risk respectability.