Yes, Zetsu is a medical ninja but you don't see him do it though.
Mabey zetsu told him
no
he is not in it
Allied ninja fighting Zetsu clones
you cant, hes not playable in any of the games yet, not even ninja storm 2
So far no. btu he might be in future clash of ninja games. The farthest clash of ninja 3 got in the akatsuki is Hidan and Kakuzu. sorry :)
Zetsu has not been fetured in ANY Naruto fighting game to date for lack of Jutsu and he hasn't relly even fought in the series, yet
She knows some basic medical ninjutsu, but I wouldn't call her a medical ninja.
Zetsu is still alive, for now.
Zetsu is a cannibal he eats humans.
Zetsu was created from Hashirama Senju's cell.
Sasuke killed Zetsu, It's highly debated that Zetsu was pulling off a Bunshin however.