While he retains most of his original looks, it now looks as if he had been experimented on by Shadaloo when he went MIA. His body has been "Frankenstein-ed", and what seems to be a mind control chip is implanted on to his forehead. Nash now looks to be a "shadow" of his former self, a clear nod to his appearance as Shadow in Marvel Superheroes vs. Street Fighter.
He now also employs new moves, among which is a new anti-air special move that replaces his old somersault kick, resembling Rugal Bernstein's Genocide Cutter in The King of Fighters and Capcom vs. SNK. He also gains a teleport move that looks like Albert Wesker's Phantom Move in Marvel vs. Capcom 3.
Take a look at Nash's gameplay trailer below.
Nash's last video game appearance as a playable character was in Marvel vs. Capcom 2 in 2000. His attire was made available as Guile's alternate costume in Street Fighter IV.