When I was reading the end of No.6 volume 2 last night since I couldn't sleep, I was like "NEZUMI IS SUCH A SLYTHERIN DAMN." (it was when he got the note about Safu and was like "well I could share this with Shion like I'm expected to but that would hurt me in the end, so nah.")
I had a lot of trouble placing Inukashi... I first thought Slytherin since they're all about fighting for themself in canon, but what would Inukashi be like outside of canon...
What a tricky character. I thought I had them figured out.