Well you haven''t given me a lot to go but here are some ideas.

- Fast and furious action
- Ability to pin against strong walls and the ability to throw players through weak ones to discover new areas
- A good dodging system
- Blurred fists accomanied by good whooshing sounds.
- Plenty to unlock and good replay value
- Smart AI with varying levels
- Varied characters fighting style and costumes
- Online and offline multiplayer
- Original material with the best of the old, take a look at Virtua Fighter 4, Tekken 4, DOA3 those games for ideas but make it original

Good luck!

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