May as well take a stab at this!
Jason Frudnick (Blaster Master)
Whilst the
Super Smash Bros. series already does a decent job at representing a large swathe of third-party characters from their NES days (with playable picks like Mega Man, Simon and Hero, as well as representation through other means for characters like Bomberman), I think that one of the missing companies in this regard is arguably Sunsoft. Hell, their iconic legacy is still well-represented and beloved even now - one only needs to look at the recent rerelease of
Gimmick! as a collector's edition to prove this!
Their library for the NES is characterised mainly by iconic platformers with fantastic music, from
Gimmick! to
Journey to Silius - but arguably their most prominent series in the modern era could be argued to be
Blaster Master, a unique early MetroidVania with dungeon-crawling elements, that's continued to this very day.
Hence, I suggest Jason... but wait, why does he look so
modern? Well, Jason's interpretation here is pulled from reimagined the protagonist of the reboot
Blaster Master Zero trilogy, made by Inti Creates and licensed from Sunsoft... which has been a pretty prominent presence on the Switch's eShop since shortly after launch, even if it's been multi-platform as well. Notably, Jason's design is based on his look from the first
Blaster Master Zero game as opposed to the second or third, as he's had slightly different looks in each game, and the first game was the best-selling of the three.
In terms of his Mii Costume, this one's equipped to the
Gunner, with his
Metal Attacker Suit and
Metal Attacker Helmet being able to be worn. His gun is actually his Blaster Rifle, albeit scaled down a little to fit - think akin to Saki's blaster for his costume. As a side note, in keeping with the original design, the Metal Attacker Helmet's visor is opaque, with the Mii's face underneath it not being visible so as to maintain the "deluxe" feeling of this costume. Also, as with other Mii Costumes, the Metal Attacker Helmet can be worn by any class of Mii, though the Metal Attacker Suit is Gunner-exclusive.