Sonic (Classic), Smash Fighters Z Wiki

Sonic the Hedgehog, also known as "Classic Sonic", and simply Sonic, is a variant of Sonic hailing from the Sonic: Mega Drive Rift. He first appears as a supporting character during Sol Chronicles 4.

Super Smash Bros. (series) - Super Mario Wiki, the Mario encyclopedia

Let's say aging was a thing in Sonic, where characters grow older

Silver the Hedgehog - WikiFur, the furry encyclopedia

Super Smash Bros. - Wikipedia

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Cream, Smash Fighters Z Wiki

Peach (SSBU) - SmashWiki, the Super Smash Bros. wiki

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Super Smash Bros. Infinite Wii - GameBrew