As of Super Smash Bros. Ultimate in 2018, Shadow the Hedgehog is the only third-party Assist Trophy to appear in every Super Smash Bros. game since the introduction of Assist Trophies in Super Smash Bros. Brawl in 2008.

As of Super Smash Bros. Ultimate in 2018, only three characters that started out as Assist Trophies became playable in future installments:

•Little Mac, an Assist Trophy in Brawl, then became playable in Super Smash Bros. for 3DS/Wii U
•Dark Samus, an Assist Trophy in Super Smash Bros. for 3DS/Wii U, then became playable in Ultimate
•Isabelle, an Assist Trophy in Super Smash Bros. for 3DS/Wii U, then became playable in Ultimate.