On second thought, I don't think it's necessary to change weapon stats around... just one of the N-ZAPs must have at least a different set (Sub and Special) than the other Shooters! Just in between Shooters, not the other classes... and if there are Shooters which own the same set, the related N-Zap must be as close as possible to the middle with all three stats!
I would build the character around the Retro theme, while still making him completely All-Round... that would be good enough!
It's very elaborate, I know... but at least I would get down not only the play style, but also the fact I'm also a Retro gamer!
Speaking of that, does Splatoon 2 tackle the Retro genre much more than the original?