There are a number of retroarch cores that work on a firestick. Here is a list of some of the more popular ones:
-Snes9x
-Final Burn Alpha
-Mame4droid
-DroidSnes
-Nestopia
-PPSSPP
-FCEUMM
If you're not sure which one to choose, you can always read the descriptions and try out a few to see which ones work best for you. Remember, you can always change the core later if you want to try something different.
