[EARTH-4] Sonic Adventure 2 ~Added Description~ by C...
這AU比較特別的是Sonic的秘密身世，類似洛克人X某遊戲的某角色（劇透）。
Mega Man X: Command Mission / Characters - TV Tropes
Dead Person Impersonation - TV Tropes
Fake Ultimate Hero - TV Tropes
Becoming the Boast - TV Tropes
Taking Up the Mantle - TV Tropes
Legacy Character - TV Tropes
