I personally use this formation:

* Main *

Lee (EIG) Hinata (GNW) *

* Gaara (3 star) *

Skills: 4-4-3-4-2

Summon: Bull

(Mystery summon: Ninja Dog Pakkun)

I use this because i don't have the best ninja's and summons. I have Monkey King, but i can't work out anything with it.