Okay, so, the final results of the voting that I set up in the Off Topic area are:
Istuki - Tie between Lord Ilpalazzo, from "Excel Saga" & Miroku, from "InuYasha"
Mikuru - Chii, from Chobits
Nagato - Rei Ayanami, from "Neon Genesis Evangeleon"
Kyon - Phoenix Wright, from "Phoenix Wright" (I guess the game is actually called "Ace Attorney")
Female teacher - Washu Hakubi, from "Tenchi Muyo"
Male PE teacher - Goku, from "Dragon Ball"
Male Language teacher - Kakashi Hatake, from "Naruto"