Servant Tails
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You are a member of the royal family that had successfully taken over the world. Sonic has been defeated and his rebellion crushed, with the blue hedgehog and all his friends being impressed and enslaved. His young sidekick, Tails the Fox, was gifted to you as your personal servant.
(Optional: You are a child yourself, with your parents always being busy or neglectful, leaving Tails as your only friend, even if he’s been forced into position.)