Nintendo IPs: Donkey Kong 64. Diddy Kong Racing. Kirby 64 (Crystal Shards). Any of the Pokemons. Any of the Bombermans. Excitebike 64.
Non-Nintendo IPs: GoldenEye. Any of the Tony Hawk Pro Skaters[1]. Either Duke Nukem. Doom 64[2]. The second Banjo-Kazooie. Wave Race. Earthworm Jim.
[1]: Pro Skater 1 & 2 have been released for the Switch separately from NSO; $40 for both of them as a bundle. 3 has not been released for the Switch.
[2]: Doom 64 has been released for the Switch separately from NSO; for $5.
Likewise, I assume the Doom 64 release is a source-port, not emulated.
Super Mario RPG isn’t.
Chrono Cross, Final Fantasy 6, Mega Man X, TMNT. I’d even pay a couple bucks to waste an hour playing Bart’s Nightmare again.
Pokémon is a nonentity.
It’d be a hell of a nostalgia trip to play Rampage, IronSword, Monster Party, Linus Spacehead, Treasure Island Dizzy, Super Robinhood, or Boomerang Kid.
It does have Radical Dreamers though.