Everyone talks about Street Fighter or Tekken, but let's hear it for the weirder, unique, underrated, or forgotten fighting games out there.
My favorite is a Gundam game. Federation Vs. Zeon and it's sequel, Gundam vs Zeta Gundam, made by Capcom. The original games in the Gundam Versus franchise of games. imo the series was at it's best when it was handled by Capcom.
I remember playing Urban Reign a lot because it was one of the only games I had for my ps2, cool gameplay.
I also played Bloody Roar 4, it's like Tekken + Mortal Kombat + furries lol, really surprising they never made more games.
The Godzilla games were a lot of fun to play, even though they were very broken and repetitive, very cool for fans of the movies.
Bloody Roar is great and pretty underrated.