I think we’re better off looking to soaps, rather than sci-fi, for inspiration. Slap a goatee on him, say he’s an evil twin, and call it a day.Given that, as I recall, the crew didn't have Wash's body? Yeah, he shows up some time later with a bunch of cybernetic organs to replace what got obliterated, and his behavior a little... off (which is totally in Tudyk's wheelhouse) and you're off to the races.
Given that Book is coming back as well, I'd bet on the animated show focusing on the period between the show and the movie.I think we’re better off looking to soaps, rather than sci-fi, for inspiration. Slap a goatee on him, say he’s an evil twin, and call it a day.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.