Blanket permission to everybody! Just be warned that there'll be flailing from Max at the very least for touching.

Shuichi usually is a very happy and energetic guy but occasionally he has his emo moments. His aura would match Ty Lee's for most of the time. |D;

Max is zen, calm, grounded but can get snarky and anger when poked in a bad way. Deep red to muddier red would be her aura according to the site Usagi linked.

Nana would usually be in a happy mood. She's not quite as energetic as Shuichi but again, piiiink aura.