I would respond to a lot of these posts about Geno, but clearly everything that could be said in favor of him is already said, so
Rex & Pyra: Xenoblade 2 to me is the shining beacon of unremarkable. So I am shocked to see that even after the Mii Costume, Rex still gets requested/predicted, especially with Jon GameXplain being so adamant about him.
Gen 8 Pokemon: Pretty much every mention of a Gen 8 Pokemon I've seen was only because of whiny pissants setting themselves up for disappointment after Byleth, after ignoring just how good the first Fighters Pass really was. Even then, why a recent Shillmon instead of something from earlier in the series that people actually love, i.e. Cynthia or Deoxys?
Kasumi (Dead or Alive): Now, it's definitely not because of the normie perception of DoA being "that tiddy game", but it's solely because in the grand scheme of fighting games, Dead or Alive shouldn't be represented next to Street Fighter, Fatal Fury/KoF, and Virtua Fighter as one of the biggest fighting games ESPECIALLY before Tekken, Mortal Kombat, Soul Calibur, etc.
Hat Kid: One of the lamest indie picks for a fighter you could ever ask for. I have no idea how Hat Kid, who is essentially Mario as a cute alien toddler, gets more backing before Reimu, Quote, Jacket, or any of the other more significant indie game characters.
My biggest reason, however, for most of these is that I see their "support" as "It's new and I like it, so it should be in Smash" which is a really weak and pathetic mindset for what is essentially becoming the biggest video game crossover of all time