Boy II Man

Boy II Man (ボーイ・II・マン) is the Stand of Ken Oyanagi featured in Part IV: Diamond is Unbreakable.

Appearance/Personality
Boy II Man is a muscular humanoid spirit with a pointy helmet resembling one worn by a medieval knight. The Stand always manifests itself coming out of the hole in Ken's cheek, made by the Bow and Arrow. It has no personality.

Abilities

 * Game of Fate: Boy II Man's power is also its weakness. As Rohan learned through using Heaven's Door, this Stand could drain the energy of another Stand user by playing a Rock Paper Scissors game and winning it. However they are strict rules to how this is played:
 * It can only play 5 matches.
 * If it doesn't win 3 times, it can't take all of the energy. It can, however, take portions of the energy in thirds, representative of each of the 3 times it has to win.
 * If it loses it can't help but return the energy.


 * Control: Boy II Man has limited control over his opponent's Stand, allowing him to control the area corresponding to the energy he drained in the Rock Paper Scissors game, as shown when he makes Rohan punch himself after taking the right arm of Heaven's Door. It's unknown if Boy II Man can absorb several powers at once to enable its growth; if so, its potential is unlimited as long as it wins each match.

Trivia

 * According to JOJOVELLER, its design is heavily inspired by one of Yokoyama Mitsuteru's mangas.