Nekozawa Senpai is my favourite Senpai of all time. I mean, of he were my actual Senpai, I would probably cry. Actually. As for his Dere type, I think he would be something along the lines of 10% Yandere, and 90% Dandere. Ugh... he's so cute.

~~~~Example~~~~

Tamaki: (Giving some sort of speech to the host club)

Nekozawa: Suoh-San, why don't you join the black magic club? (Appears behind Tamaki)

Tamaki: (Screams in horror before dying on the inside)

Nekozawa: (Thinks: Why doesn't he notice me!?!)

Belzenef: (Talking, but only Nekozawa can hear him) Burn him! Burn his corpse!!

~~~~End of Example~~~~

Oh yeah, I forgot to mention... Belzenef is 100% Yandere.