There are opinions, and there are wrong statements which you are just making here.
Hero not being featured in a Nintendo system bar spinoffs (“the same goes for Hero”)?
All eleven core Dragon Quest have appeared in Nintendo systems, starting with the first game for the Famicom and NES, since the game was nota Japanese exclusive.
Eight of the eleven Dragon Quest games debuted on a Nintendo system, the other three debuted in Playstation (VII, VIII and XI) but were later ported to Nintendo platforms.
Ten of the eleven core games are playable on the West in either the 3DS (IV, V, VI, VII, VIII, IX) or the Switch (I, II, III, XI), both easily available platforms as of now. Hell, this is far more you can say of most First party franchises with representation in Smash and the accessibility of their games.