I went full autism and elaborated on the tiers:
PATRICIAN TIER
People who ask for balance in villain representation Masked Man, K. Rool, etc
People asking for other nintendo reps to get their deserved attention: Advanced Wars, Golden Sun, Custom Robo
Characters that would simply be a good addition to the roster gameplaywise
Third Parties that are iconic in gaming history and go well with Smash/nintendo
Wanting more content for both online and single player, with more customization for online and more crazy modes to play and enjoy the game.
Wanting characters that are secret like Mewtwo in Melee where the conditions are cryptic. Wanting the future DLC characters to not be stated how to get them and having fun figuring out how to get them by playing the game. They don't even tell you when an update happened.
Stages that are fun and balanced to play outside of "Final destination" version of the stage.
Wanting stages with easter eggs, love letter to fans, and cameos of other characters.
COOL TIER
people wanting characters that would be a good addition and good and nintendo related, representation of IPs aside
People wanting more Reps from already represented IPs, but the characters are cool.
3rd Rep of an already represented IP, but the character is a fan favorite that would shine gameplaywise
Wanting characters with unique movesets that bring something fresh (Polearm users, whip users, etc)
Third Parties that are iconic
Wanting a cool Story mode that has replay ability and challenge
Wanting something like Brawl's stickers or Smash 4's equipment parts for a single player experience that challenges you to use the equipment/stickers creatively to pass the stages.
Wanting a 1-4 player single player campaign like a fast paced Kirby Super Star, except actually fun, with bosses actually being enemies from Nintendo Ips and not OCs,
and not Floaty or boring like Brawl's SSE
Wanting Trophy Easter Eggs like in Melee
OK TIER
Nintendo IPs that have yet to be represented in Smash, their IP is nothing special but the character is cool
Third Parties that are ok, but could work
4th or above character of an already represented IP, but the character would shine gameplaywise
Characters that have slim chances to enter, but they'd fit right in
Wanting 2nd Character from Third Party Rep Guest that is a Veteran that is iconic
Wanting Adventure mode back
MEH TIER
Nintendo IPs that have yet to be represented in Smash, but their IP is whatever
People wanting more Reps from an already well represented IP
Yet another character of an already oversaturated IP (Fire Emblem, Pokemon) and they wouldn't really shine (yet another sword user)
Wanting gimmicky characters that are different, but doesn't mean it fits with smash, it's good, the meta, balanced or they're simply not fun to play/play against.
Semi-clones, but they're like Ryu to ken and their gameplay is completely different
Characters have slim chances to enter, but hey with Sakurai's touch they could work
Wanting 2nd Character from Third Party Rep Guest that is a Veteran
Wanting Subspace emissary back
DELLUSIONAL TIER
anything that simply won't happen
Semi-Clones and clones gameplay wise.
Wanting more sword users that bring nothing new to the table
DEAD IN THE WATER IP that only hipster faggots care about and the character wouldn't even fit gameplaywise
Ridley
Goku or any retarded anime choice
Characters that simply won't happen due licencing issues
Anything from Pachinkonami (won't happen)
Wanting 2nd character from Third Party Rep Guest
Wanting stages that don't have ends on the sides where you can cheese the enemy by camping on the sides
Wanting meme stages with annoying hazards
Wanting an anime-tier single player storyline