In the announcement for Super Smash Bros. pour Wii U (2014) in 2013, Satoru Iwata said "We have one last title to show you." In the announcement of Super Smash Bros. for the Switch, Yoshiaki Koizumi kept the tradition, saying the same sentence as Iwata, as a homage to the late president.
David Hayter returns as the voice of Solid Snake for the first time in a video game in eight years, with the last role being Metal Gear Solid: Peace Walker (2010). He previously voiced Snake in a Ford Focus commercial in 2016.
This game marks the 100th time Charles Martinet has voiced Mario, for which he has been given a Guinness World Record for most video game voiceover performances of a single character.
Ridley's introduction tagline, "Ridley Hits the Big Time!", is a reference to the debate surrounding Ridley's inclusion in Smash Bros. in previous games, with many people suggesting that Ridley was too big to be a playable character.
Contains 83 playable characters (including 12 DLC characters). This includes all characters from previous Super Smash Bros. titles.