Sukuna is a highly intelligent BATTLE PHYCOTIC, with thousands of years of experience in battles which will usually make him use his attacks wisely until he has find a 100% adaptable win plan. He also wont pull out fuga unless his domain is activated and secured and its a last resort move. He can also insanely quickly regenerate using reverse cursed technique, which is negative magical energy multiplied against itself to make positive magical energy which boost its regeration by centeries