Knuckle Bine from Hunter x Hunter
His Nen ability, Hakoware, attaches interest-accruing energy loans to opponents. A cute mascot called APR follows the target, announcing their growing “debt” with each hit they land. When the debt exceeds their capacity, all their power gets sealed for 30 days. The financial metaphor creates a uniquely strategic battle system where Knuckle must survive long enough for the interest to compound.