Oh, I've got plenty. I vary from ROM Hacks other people have made [some are English translated or just humorous stuff to give the game a weird WTF feel] to games I used to own as a kid to ones I almost bought at the mall back in the day, but passed on [Wario's Woods for example].
MegaMan 1 is crazy difficult. I prefer 3, 5, and 6. Super Mario Brothers 2 and 3 is pretty cool. For lulz, I even got some reknowned critically shunned games for their difficulty and complexity: Who Framed Roger Rabbit, Dr. Chaos, Golgo 13, to name a few.
Fighting game was: Street Fighter II series, Fatal Fury, stuff like that. Since my internet ping is kinda bad, I can only play someone on the older games on my Kawaks emulator once in a blue moon.