Punk

Punk, or known by his Robot Master serial number MKN-002, is a Robot Master and a member of the Mega Man Killers created by Dr. Wily in the Sonic the Hedgehog and Mega Man comic crossover event, Worlds Collide. Created to destroy Mega Man, he and the rest of the Mega Man Killers–Enker and Ballade–were revived after the Genesis Wave reset both Mobius and Mega Man's world.

Punk posses a Master Weapon in which he can form himself into a ball (almost identical to Sonic's Spin Dash) to follow the opponent around in a spiked-ball, known as the Screw Crusher.

History
At some point in the rewritten reality of the Earth in the year 20XX, created due to the Genesis Wave, the Mega Man Killers were utterly destroyed by Mega Man. However, by using the time-space altering properties of the Genesis Wave, Dr. Eggman and Dr. Wily were able to revive the Mega Man Killers. (WC #1, #10)

Upon Mega Man, Sonic the Hedgehog, Miles "Tails" Prower, and Rush accessing the Wily Egg and entering inside, Sonic and Mega Man were telling each other about the Wily Egg reminds them more of there respective final-zone areas. Suddenly, Sonic notices guards blocking their way, and Mega Man recognizes the guards as the Mega Man Killers. The heroes then begin the fight the Mega Man Killers, as Sonic took on Punk; Tails and Rush fought against Enker; and Mega Man took care of Ballade. Sonic is able to make Punk accidentally destroy Enker via from Punk's Screw Crusher. Punk is then destroy by the combined efforts of Mega Man and Rush. Whether Punk or the rest of the Mega Man Killers will return to the crossover is unknown at this time. (WC #10)

Weapons
The Screw Crusher is the Master Weapon used by Punk that first appears in Mega Man #27. With this move, Punk can form himself into a ball, almost like Sonic's Spin Attack, to where he follows his opponents around until he hits an object. In Worlds Collide, Punk accidentally destroys Enker while using this move. (WC #10)

Trivia

 * As with most of the Mega Man series character are named after music, Punk's name is a reference to the music genre popular to the United States, known as punk rock.