Here you can speculate potential upcoming assist trophies and pokeballs.

-At the moment I speculate that Sasuke, Sakura, or Kakashi will represent Naruto in the assist trophies department.
-I speculate the hammer koopa from Mario.
-I speculate either Knuckles or Shadow as assist trophies for the Sonic side.
-I also speculate master balls.
-That's... About it... For now.

Can wait to see what you guys have speculated.