The "plant guy" is Zetsu, who is a member of the Akatsuki. In the early episodes of shippuden, he usually just watches fights from the sidelines and reports the outcome to the other Akatsuki members.
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Nagato was considered a bad guy at first, but changed to a good guy before he died.
The first time Might Guy fights Kisame is in Naruto in episode 82 where Might Guy fends of Kisame from his comrades. Kisame and Itachi quickly leave after Guy's appearance. The second time Guy fights Kisame is in Naruto Shippuden in episodes 250 and 251
The overweight character on Naruto is named Choji. To view a picture of him, please see the Related Link below.
Sasuke Uchiha is so much cuter than Naruto!