1. mario - Fawful so we can finally have mario rpg rep, and also i just like him. final smash could be either dark star or cackletta soul, alt costumes include dark fawful and the funny pink costume from superstar saga's endgame.
2. donkey kong - Cranky Kong is the "serious" answer; would have the ducktales pogo and false teeth projectiles that bounce around and latch onto enemies. meme answer is
hailed as a god.
3. zelda - my classic meme answer trio has always been Tingle, Beedle, or Groose; serious considerations are either Skull Kid (rip) or 2d zelda Pig Ganon, armed with his trident and magical attacks
4. metroid - there aren't many "important" characters in metroid left to use imo; Just A Metroid as a playable character would be hilarious and i could also see a Chozo/Chozo Statue character working out. any of the hunters from MPH could work. meme answer is Anthony
"Remember Me" Higgs
5. yoshi - who else but Kamek?? i know he's a mario character too but so is the entire yoshi franchise.
6. kirby - easy answer is Bandana Waddle Dee but any of the dream friends from star allies could work since they all have huge movesets to draw material from. meme answer is Escargoon
7. star fox -
Slippy
8. pokemon - i have a lot of desired pokemon reps in smash but i've always wanted Grovyle as the gen 3 rep; specifically, the mystery dungeon grovyle, which would kill two birds with one stone. alternatively, Buzzwole or Pheromosa. i have Wobbuffet as my "meme answer" here but i would actually genuinely like to see wobbuffet playable because i think the whole "only ever counters" could have some applications as a ridiculous gimmick character
9. earthbound - Porky would fuckin rock and would be a great villain rep. final smash would either be GIYGAS or his spider mech, and his alt costumes would be split between his earthbound and mother 3 designs (also pigmask alt). meme answer is one of them exploding trees
10. f-zero - i only have meme answers for this.
(serious answer is pico)
11. retro character - Bubbles from Clu Clu Land as a sort of grappler-type character. meme answer is the Satellaview mascots Parabo and Satebo, who have no legacy and aren't even game characters technically but i just like them that's all
12. fire emblem - someone who doesn't use a sword
13. kid icarus -
14. warioware - a lot of candidates for this one that i can't really narrow down. 9-volt, orbulon, mona, dribble and spitz, dr crygor, etc i can't choose and you can't make me choose
15. metal gear - not familiar enough with metal gear to have a solid answer so uhhhh Slippy again (he counts right)
16. sonic - Eggman with eggmobile altmode. he can have the fastest running speed tied with sonic because he canonically does. i could also take Gamma, Omega, or Chaos. meme answer Big the Cat
17. pikmin - not a lot of characters from this so i'll go with President of Hocotate Freight as an olimar echo; winged pikmin is replaced with the ship's research pod. alternatively, make alph his own character and give him rock pikmin. meme answer Bulborb
18. animal crossing - Mr. Resetti. i don't care if he scares kids, i want to play as him
19. megaman - i'd be cool with Protoman or Bass i guess
20. nintendo - Monita from Nintendo Land i guess (actually wouldnt Parabo and Satebo fit under this since they were marketing mascots???)
21. punch-out - King Hippo just so eggplant wizard's boyfriend can also be playable; i wouldn't want glass joe because having a straight up intentionally bad "joke character" would just be boring, although maybe they could make him work somehow
22. pac-man - ms pac-man echo, duh, or maybe a ghost with different skins based on the different ghosts (blinky, inky, pinky, clyde, sue, whatever other extraneous ghosts were in the spinoffs, and the dark blue vulnerable state). meme answer is the bdsm-lookin ghost from the shitty cartoon
23. xenoblade - don't care enough about xenoblade to have an answer for this. the funny assist trophy guy who says freezy i guess
24. street fighter - M. Bison with "YES! YES" taunt for maximum 2007 youtube power
25. any other final fantasy representation besides a character, stage and two songs. anything. it doesn't have to be a character. please squeenix. (but if it is a character it's Ultros because i'm predictable)
26. bayonetta - i also don't know enough about bayonetta to have an answer but i know Fortitudo is Too Big for Smash Bros
27. splatoon - obvious answer is Octolings as an inkling echo but meme answer is Sheldon...his final smash is his flying truck
28. castlevania - Dracula or Alucard one of these days. can't think of anyone else but my meme answer is
Puwexil the Licking Skull
29. smash bros - a Primid from subspace emissary feels the most appropriate. could even have the thing where it has a different face every match.
30. series not yet represented -
PEOPLE GET READY, IT'S TIME FOR THE WIDE WORLD OF RAPTOR