Jean Couronne XIV

Jean Couronne XIV is the long deceased human partner of Crown. When the two EM Wave Change, they become Crown Thunder.

MegaMan Star Force
After beating the game and going back to Earth, He shows up in the Dream Island junkyard. Geo and Omega-Xis will find a ghost who will tell he is a dead human king called Jean Couronne XIV. He died long ago, but his ghost remained and was able to EM Wave Change with Crown to become Crown Thunder. He tells them to meet him at the Junkyard EM Wave Road.

He appears EM Wave Changed in the Junkyard and challenges MegaMan to a battle.

MegaMan Star Force
Jean and Crown haunt an abandoned amusement park. They are seemingly invincible, because no attacks could hurt them. But, it is revealed that striking the amusement park itself would cause damage to them because Jean's soul was linked to it.

Later, Crown can turn into him, but has an arrow through his head.

He also appears in the last episode of Shooting Star Rockman Tribe with all the FM-ians and their compatible humans. 

Trivia

 * His full name is Jean Couronne Velmond Giorgionne XIV.