Ken Oyanagi (JJBA Supplement)
From D&D Wiki
Small humanoid (Human), chaotic neutral
Stand Proud Focus. Ken takes 3 less damage from from non magical piercing, slashing, and bludgeoning damage. He also has advantage on saving throws against being Charmed, Frightened, and Paralyzed.
Exchange Blows. When Ken takes damage from a hostile creature or as a bonus action, they make a DC 11 Constitution saving throw. On a success, he can make 1 additional melee attack on each of their turns. He can only have up to 2 "Exchange Blows Stacks" at once. Using extra attacks during your turn does not consume the stacks. They may spend 1 stack to make a melee attack against creature without using a reaction. All stacks are lost once initiative ends.
Exploit the Armor. When Ken successfully hits a creature with a melee attack, his melee attack rolls gain a +1 bonus against the target for 24 hours. This can stack up to +5.
Unarmed Strike. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 3 bludgeoning damage.
Boy II Man. Ken challenges one other humanoid to a game of Rock, Paper, Scissors. For each win, he gains 1/3 of their Stand User Alignment features that they have. They lose the ability to use said features. If they win 3 times, they regain all lost Stand abilities. If the round is a tie, they must replay it until there is a winner.