Let's see
I recognize Super Mario & Sonik 2, Sonic & Knuckles 5/Sonic 3D Blast 6 and their fanmade improvement hack, Kart Fighter, that one old SMB1 rom hack, the Sonic Adventure Island bootleg, Year of Luigi (shoutouts to LuigiWatching) and The Adventures of Quik & Silva
I definitely recognize that dancing one from somewhere but I'm not sure of the origin and the ones on the right are the only ones I don't recognize at all
I mostly remembered Quik & Silva from some video I watched on the subject of Sonic appearing in other games (as well as a wiki page about Sonic references and cameos), I don't think I'm very familiar with any other Amiga related Sonic stuff (outside of songs that two sonic fangames use)
Looking through that wiki page made me learn Bean the Dynamite (and kinda Bark) consistently made cameos in games every 1-2 years up until 2001, just an extra fun fact for the heck of it
Comments
I know the weird spin jump with the head sticking out but I forgot the name
I recognize Super Mario & Sonik 2, Sonic & Knuckles 5/Sonic 3D Blast 6 and their fanmade improvement hack, Kart Fighter, that one old SMB1 rom hack, the Sonic Adventure Island bootleg, Year of Luigi (shoutouts to LuigiWatching) and The Adventures of Quik & Silva
I meant World Heroes 2, I somehow confused it with Kart Fighter