Smash is cool, actual fighty games are cool. I am good at them but don't play competitively. The majority of combos are just rolling the stick around or inverting direction while pressing 1 or 2 buttons. The characters I like are ones where I just kind of intuitively do the combos, trying to memorize and do them at specific times doesn't work as well for me. I also "main" characters based on whether I like the way they and their moves look. Why beat someone up if you can't look cool while doing it? My brother is more serious about the genre and has an arcade controller but we come out pretty even when we play.
I am not that surprised that San is Really Good at other video games. In crpg he was not only a skilled player but could get into the nitty gritty details if you had mechanics questions. I learned a lot from watching him play and from asking him stuff.