Seelkadoom the Hedgehog, SonicRPG Wiki

Seelkadoom the Hedgehog is a fusion clone of both Sonic and Shadow the Hedgehog. He is the main antagonist of Sonic RPG. He was created by Dr. Ivo Robotnik in his laboratory with the Chaos Emeralds, combining their negative chaos energy with the DNA of Sonic and Shadow. He is the completed work of Dr. Eggman's Grandfather, Gerald Robotnik. Seelkadoom was originally inspired by the fusion of Sonic and Shadow, known as Shadic, who appeared in the 2004 Movie "The Power of Nazo". MidNightMaren then

Episode 9, SonicRPG Wiki

Erazor Djinn (Sonic and the Secret Rings) vs Dark Gaia (Sonic Unleashed) Who would win? - Quora

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Episode 5, SonicRPG Wiki

SonicRPG Wiki

Seelkadoom the Hedgehog, Villains Fanon Wiki

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NAZO SONIC vs SEELKADOOM! (Sonic: Nazo Unleashed DX vs Sonic RPG)