As with my last Hakua upload, I'm unsure of her little brother's name. She calls him Kuu, which, while I'm unsure if it's his real name, could serve as a character tag a la "kuu_(konshin)" or somesuch. I'll go for it if you all agree.

The kid's name is Kureha. Here's an info dump on him. Note that he is actually designed by another artist.

On that note, here's Mitsugi (Info Dump ).