Those who have been speculating which characters, stages and modes will be in the next "Super Smash Bros." game for years will likely know that disappointment is like. Going into Smashboards, social media or GameFAQs, they probably know firsthand of being let down that Masahiro Sakurai did not select their favorite characters to be playable.
Most people, however, are new to speculation and as such have lofty expectations when it comes to their favorites getting in. This will be met with crushing disappointment that will hopefully serve as a learning experiment.
This is not a patronizing "you should be appreciative" because Sakurai achieved world peace or gave you something you didn't want. Rather, it's best to ask why you are dissatisfied with the outcome and if that needs to change.
Let's be frank, Incineroar from "Pokémon" and Ken from "Street Fighter," two heavily rumored characters, are probably it. Sakurai has confirmed that he will be slowing down on character reveals. We will not see a repeat of "Everyone Is Here!" that breaks headline on social media by revealing that all characters from previous "Super Smash Bros." games are returning.
The most anticipated newcomers, Ridley from "Metroid, King K. Rool from "Donkey Kong," and Inklings from "Splatoon" are all here, and there are no major omissions worth noting that could help sell the game, at least from a first-party perspective.
With likely seventy-six characters, we're already looking at an incredible roster.
Now that said, if the roster disappoints, please do not throw a tantrum on the Internet. Do not go into speculation why the Assist Trophy can totally still be playable on the initial roster before DLC or use inappropriate 9/11 or Hitler references.
Rather, if there is something you don't like about the game, advocate for change.
Start gathering up people you know will agree with you and formulate a campaign. If it is for a character, find artists, modelers, and content creators who want the same thing and push for it. It will take years of hard work and debating with detractors that may not see things your way.
However, being constructive about your complaints can lead to change, especially if said change being made will lead to you buying the next Super Smash Bros. game.
That said, if the disappointment is not worth fighting it, which it will be for most people, then it is best to let the undesirable outcome take its course by laying low and serve as a reminder that a sum is not the whole of a product. "Super Smash Bros. Ultimate" is going to be an amazing game and I hope the community will play for years on end.
Learning to deal with disappointment constructively is crucial towards preventing headaches in the future.