I would say:
Akatsuki
Sasuke
[sometimes] the Nine-Tailed Fox
Chat with our AI personalities
The hitchhiker is the antagonist in "The Hitchhiker."
mr.summer is the antagonist.
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.