Notes:

By Davy on Twitter

See the source for era-accurate Melee, Brawl, and Ultimate versions of Indie Smash!

Aside from Pico, Reimu, and Doom Guy / Slayer (the latter two being my most wanted characters in Smash), I do not know who the other characters are and what games they are from. If anyone is willing to let me know, please feel free to do so! NVM all characters have been identified and properly tagged!