Joker

Joker (ジョーカー) is a combat Wizard and member of the Dealers in MegaMan Star Force 3. Though he has no known EM Wave Change, Joker is shown to be nearly invulnerable to Noise because of the Joker Program that the Dealers developed. He is also able to use the program in order to Finalize and become Dread Joker, a very powerful EM Being who fights with brute strength.

MegaMan Star Force 3
Joker plays a more subtle role throughout the events of the game, often seen performing the Dealers' more clandestine operations. He is also the one at Alohaha who fragments Luna Platz and scatters her data, forcing Geo Stelar, Omega-Xis, and Acid to work together to recover her.

Though Joker often avoids fighting Mega Man by distracting him and fleeing, the two eventually face off at the Dealers' secret Crimson Factory. After his defeat, Joker attempts to take Mega Man and his friends with him by self-destructing. His attempt, however, fails as Acid Ace sacrifices himself to neutralize the explosion, scattering heavy amounts of Crimson nearby.

Etymology
Joker is named after the playing card of the same name, in reference to being a part of the Dealers.

Trivia

 * The joker card is not a part of a standard deck of playing cards, which symbolically contradicts that he is the only member of the Dealers who remains loyal to Mr. King.