I would say:
Akatsuki
Sasuke
[sometimes] the Nine-Tailed Fox
Chat with our AI personalities
mr.summer is the antagonist.
The hitchhiker is the antagonist in "The Hitchhiker."
The protagonist is Flik the antagonist is Hopper
The protagonist is Thor the antagonist is Malekith
Naruto vs. Haku, Naruto vs. Orochimaru, Naruto vs. Kimimaru, Naruto vs. Sasuke, Naruto vs. Deidara/Sasori, Naruto vs. Orochimaru, Naruto vs. Pain.