I did give good reasons. And I've read the posts and arguments you've made for the last few pages. The very definition of irony is you calling anyone else stupid.
But you know what, I'm going to feed the troll for the hell of it. Because I love it when people get annoyed at posts on the internet.
"He was important in MM". He was a plot point of a supporting character. Nothing more, nothing less.
Without him, you couldn't get a mask, right? Zora was just as important in Ocarina of Time because without her you couldn't get the third stone. Sara was just as important because without her, you couldn't get the first Ocarina. There's quite a lot of supporting characters in the Zelda games that, without their help, you couldn't progress through the game. Why HMS over them?
"MASKS AND MOODS!" Ok, random pointless Caps Lock. Moods? What the hell?
"Now your just being stupid." It's "you're", Captain Kettles-Are-Black. And for your information, Navi is just as practical in a fight as Happy Mask Salesman. Navi floats around, says "HEY! LISTEN!" and, you know, gives you advice and supports you. HMS, well, sells masks. And supports you with advice. That's it.
Why should he get a high priority over a fairy like Tingle, or a character from a different videogame? What star quality does he possess that should allow him to get into Brawl over several other candidates? Wario's famous for the Wario-Ware games, Snake is famous for Metal Gear Solid, Fox is famous for Star Fox, Pit comes from Kid Icarus because it's an underrated gem that Sakurai liked. And they're all main characters. Why should Happy Mask Salesman get in, in comparison?
"Kirby copies ability's the HMS would use the masks as weapons. Nothing alike." One character switching between multiple guises, with different abilities for each? Yeah, 'nothing alike'. Hey, know that I mention it, Zelda/Shiek can do the same thing, and she's already from the Zelda series.
"I thought so too until I looked outside the box and realized his potential" - at the very least he could, I dunno, punch and kick. Like I said about Olimar before, how useful is he as a FIGHTER? What does Tom Nook have besides his small size, small limbs, and possibly a sweeping broom?