PPSSPP - PSP
Snes9x EX+ - Snes
Duckstation - PS1
Redream - Dreamcast
Dolphin Emulator - Wii/Gamecube (I have not used this myself)
ScummVM - old pc adventure games
None of these require any tweaks but might require bios files. Just install from playstore and point it to your roms.
Retroarch - Arcade, 8 bit, 16bit, etc.
Looks a lot harder than it really is. Follow any tutorial.
Tested on galaxy s8+ with custom android 10 rom. I use otg usb c to wired xbox 360 controller. I have also tested otg usb c to 4 port usb 2.0 hub to two wired xbox 360 controllers for local multiplayer. All works fine.
Hardly play on it because of all the wiring and prefer to play on TV (Pi 4) but it's still cool to have.
I was actually thinking of buying the kishi v1 (3.5k @ amazon) to play some snes rom hacks on the go but somehow dropped the idea.