This is hella late but might as well answer this.
For what it's worth, when a Hunter is used in anything they're not using the Wilds design - Obviously because Wilds isn't even out yet, but also mainly because the Rathalos Armor is iconic to the series and pretty damn distinct
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The thing about Monster Hunter is that while the avatars themselves are pretty generic, the
weapons are emblematic of the series just as much as the monsters. That's the whole point of the game, kill monster, harvest parts, craft a weapon made of monster parts, kill a bigger monster, get a better weapon, rinse and repeat. That's what makes it Monster
Hunter and not just Monster. The weapons are almost treated as characters in terms of distinct movesets; Each weapon has a distinct playstyle, and fans grow attached to specific weapons that suit them.
The Greatsword and its high-damaged charged attacks, the Gunlance and its explosions, the Switch Axe and its chainsaw function, the Insect Glaive and its outrageous aerial mobility, the Longsword and its counters and stupid anime stunts, the Hammer and its, uh. Actually yeah there's nothing really distinct, it's a hammer and you club things with it and they die.
But you get the message; The Hunters are generic avatars that would be used as vessels for the armor and weapons, but those armors and weapons are very distinct and fleshed-out. Sure, you can slap the Rathalos gear on a Mii, but a Mii can't pull off a True Charged Slash with a sword three times their size, and either way the Hunters aren't these strange little bobbleheads in the game. Fighters are the main way people experience Smash, and Monster Hunter fans are quite attached to their stupidly oversized weapons and their corresponding movesets. If we got everything
but a fighter from MH, people would
definitely be disappointed by the absense.