[@Yankee] I was just thinking a nerdy type is exactly what we needed on the boy side! Excellent! 
Re: pairings, I guess Ei x Suzu and Mika x Ryuu are pretty set, but I'm not really sure about the rest? I guess it's up to everybody else to decide. I can say that Eikichi is gonna annoy the heck out of this guy until he becomes friends with him and Haru, probably because he's caught a glimpse of the okatu side underneath and decided it would be fun to mess with him. Or they can already be friends! 

Eikichi & Haru & Mika & Suzu - get along well
Junko - not really "friends" with anybody?
Koharu & Takaya - ???
 
The more established friendships, the better, in my opinion.