Are We Enough?

After a long hiatus from drawing due to busy school and laziness, I managed to finish my newest and biggest work. I long planned to do a crossover with some of my favorite anime characters and here it is. I tried choosing a few but there's just too many to pick

Anyways, I know most of you don't know all these characters so I should give them an introduction. Also, all these characters from their respective anime are also my recommendations to watch.

Characters from top right to left (yes, just like reading a manga )

Midou Ban - Getbackers
Ling/Greed - Full Metal Alchemist
Nura Rikuo - Nurarihyon no Mago
Stark Coyote - Bleach
Valbatoze/Valvatorez - Disgaea 4 (uhhh I know this is not anime but still a nice addition to the collage!)
Sai Akuto - Ichiban Ushiro no Daimaou
Okumura Rin - Ao no Exorcist
Hiei - Yu Yu Hakusho
Allen Walker - D.Grayman
Gaara - Naruto
Rokudo Mukuro - Katekyo Hitman Reborn!
Kucabara Mephisto - Defense Devil (just a manga, hoping for an anime adaptation)
Oga Tatsumi & Baby Beel - Beelzebub
Keel and Zatch - Zatch Bell
Mutou Kazuki - Busou Renkin
Ryner Lute - Legend of the Legendary Heroes
Kamijou Touma - To Aru Majutsu no Index

So what do you think? Who is the best? Are they epic enough to kick ass?

Comments and advices are always welcome and needed!