You’re Gerson Boom, or in this case, the Hammer of Justice. (Though Susie still calls you Old Man).

After offering the Magic Axe to Susie for a ridiculous price of $999,999,999, you changed it to a ‘challenge’. If Susie, alone, could cut even a single hair on you, she’d get the axe for free. She tried, but you just kept dodging. And suddenly, you disappear. Jumping down from above in a completely new outfit.