Extra Life (Sonic the Comic), Sonic Wiki Zone

The Extra Life is a character that appears in the Sonic the Comic series published by Fleetway Editions. He is an evil clone of Sonic the Hedgehog created by Dr. Ovi Kintobor before he became Dr. Robotnik. The Extra Life looks identical to Sonic the Hedgehog, except he has slit-shaped pupils, messier fur on his ears, and sharp fangs for teeth. The Extra Life was created by Dr. Ovi Kintobor, before the accident that turned him into the ruthless Dr. Robotnik, to help his friend Sonic the Hedgehog

Super-Sonic Kick, Sonic Wiki Zone

After reading a bit into interviews and developments wiki I think I can tell why sonic is inconsistent (other then the obvious being rushed) : r/SonicTheHedgehog

Friday Night Funkin' VS Extra-Life Sonic - High-Effort Revival (FNF Mod/Hard) (Fleetway Comics)

Sonic 3 - Sonic Wiki - Neoseeker

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What alts would you give Sonic if you had full control : r/SmashBrosUltimate

Sonic the Hedgehog (Sonic the Comic) Respect Thread - Gen. Discussion - Comic Vine

Sonic the Hedgehog (Archie Comics) (Comic Book) - TV Tropes

Extra Life (Sonic the Comic), Sonic Wiki Zone