Vertor Man(side scroller) revamp the graphics, add new enemies, make the levels/game longer, add new arsenal....and keep it as a side scroller.
GoldenEye.....i would like to see a more polished game with better graphics and better level design. Add better dialogue and cutscenes but keep the gameplay the same.
Mario 64.....i love this game because it was fun as hell and somewhat challenging. I'd like to see a remake. Create a different and bigger castle with different levels. but keep the gameplay the same. exploring the whole castle and unlocking doors was the best.
Twisted Metal....its long over due!