I also question some of the choices here.
Ren Akiyama: Was nice to Yui and her Obaa-san, and he generally got along with Shinji.
Tendou Souji: Not a dick, just extremely confident in himself.
Tsurugi: Was child-like in a sense.
So all in all....king of Dicks is Kusaka, strangely enough one of the reasons why I kept watching Faiz.
Unlike a certain other dick *coughkageyamacough*, he can actually wipe the floor with his enemies. Which makes him all the more badass in a sense.