The TW Network
Megaman Variations
Fighter ID:
Full Name
Mega Buster, Variable Weapon System, Various Energy Attacks
Dr. Thomas Light (creator), Roll ('sister'), Protoman/Blues ('brother')

Marvel vs Capcom
From MegaMan series. PlayStation exclusive variant "Magnetic MegaMan" is unlockable after beating the game as MegaMan, then holding SELECT while choosing MegaMan.
Marvel vs Capcom 2
From MegaMan series.
Street Fighter X Tekken / Street Fighter vs. Tekken
Playstation 3
PlayStation 3 and Vita versions only. DLC.
Super Smash Bros. (2014)
Wii U
Guest character representing the MegaMan series.
Super Smash Bros. Ultimate / Dairantō Smash Brothers SPECIAL

Marvel vs Capcom
The Ultimate Challenge!
Dr. Light's creation is the Robot of Justice. He summons his support robots to fight evil!
Characters are brother or sister to one another.
Street Fighter X Tekken
Middle Aged Hero!
Known as a Digger, a person who digs up relics from the past for research. He is a hot-tempered man, but has a strong sense of justice and is also very polite. His weak point is that he is easily rattled when backed into a corner. He is always running around in a hurry due to the demands of his partner Roll, and this time he's been asked to travel to Antarctica to retrieve a mysterious box.

Fun Facts
In 2000, Capcom released Cannon Spike (USA, Gunspike JPN) for Naomi and Dreamcast. A top-down shooter developed by genre masters Psikyo, it featured a number of Capcom mainstays in starring roles.

The arcade version featured @char=charlie_sfa@, @char=cammy_stf@, and a redesigned @char=arthur_mvc@ alongside original characters Shiba Shintaro (the skateboarder) and Simone (the lady). Exclusive to the Dreamcast were bonus characters @char=megaman_mvc@ and @char=bbhood_das@.

@char=vega_stf@ also appeared in redesigned form as "Fallen Balrog," a boss.
What could have been
According to game co-developer Alan Noon (who also played Blade and his palette-swapped cohorts in the game), Capcom initially did not specify that the game would be based on the movie, just that it would be a new Street Fighter with digitized graphics, using actors for the movie. Under the impression that they were designing Street Fighter III, Noon and the rest of the team came up with a list of fighters that included Ryu, Ken, Chun-Li, E. Honda, Sagat, Vega, Cammy, Akuma, M. Bison, Blanka, Dee Jay, Fei Long, Dhalsim, Sheng Long (Gouken), Geki, Retsu, Lee, Gunloc, and Mega Man.