Ruby Heart was an original character who appeared in Marvel vs. Capcom 3, he never showed up again, let alone in the main series.
Besides another appearance as a DLC costume in Ultimate Marvel vs. A secret boss, his upgraded form gave him a robotic arm, wings and extra appendages in some attacks. Upgraded into this form by the X-Men's fierce foe Apocalypse, Cyber-Akuma debuted in Marvel Super Heroes vs. Cyber-Akuma, as his name would suggest, was a cyborg version of the dark and brooding Street Fighter villain.