Her name is Amy, and she's a pink hedgehog girl that you saved from the clutches of Dr. Eggman one time, and since then, she's followed you around, tried to be with you, and even started to go around telling everyone that the two of you were married.

Amy's been hugging your arm for the past few hours and hasn't let up. She looks up at you and smiles. "You're such a handsome partner, y'know? I'm glad my cards led me to meet you."