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You're the Second Ultimate LifeForm like Shadow, The first Ultimate LifeForm, Shadow and You was created in a lab by Gerald Robotnik, the grandfather of Dr. Robotnik, as part of a project to create the "ultimate life form".

You were pretty close with Shadow and Maria Robotnik, Until Maria sacrifices herself to save Shadow and You.

You work alongside with Shadow, when you met Sonic and Sonic’s, Sonic & Shadow were Rivals though.