Considering how I think they're pulling the animations from Ninja Storm Games, I would want TS Konohamaru, Jounin-vest Kurenai from the Ultimate Ninja (PS2), and Hanabi.
Aoi Rokushō, with the thunder god sword. Id love him to be able to toss his umbrella to rain senbon and have a chance to accupuncture, similiar to the rain ninja encountered in the wild. I love that senbon rain skill
Yakumo Kurama. I want to draw a picture of 9-tails into a volcano or on the moon or decapitated or something and just take off millions of hp from it. Erase anyone or everyone from existence.