Ken will be an echo fighter for Ryu, meaning he'll be essentially the same with a different appearance and animations, series creator Masahiro Sakurai said in Thursday's Nintendo Direct livestream. The primary way to obtain these spirits is in Spirit Battles, in which, for example, Iggy Koopa would fight with small red Bowsers. We expect this to be a story mode of some kind, following up on Super Smash Bros. It also announced Smash World which the connects to via the Switch Online app. The presentation also touched upon more Assist Trophies.
You'll be able to specify certain rulesets for rooms online for matches.
Ken of the Street Fighter games and Icineroar of Pokémon will "fight fire with fire" in the new release. This time, you can knock assist trophies off the map, giving you a chance to avoid getting hit by their attacks. A DLC pass for five characters will be sold, and players who buy the game on the eShop or register the physical game before January 31 will get Piranha Plant as a character in February. Winning battles against them could earn you spirits, new support characters that buff your fighter's abilities and grant them additional ones when you're in a regular battle, or perhaps just unlock more characters for adventure mode.
Whether or not the "leaked" characters will find their way is uncertain - if there's no Banjo-Kazooie we'll feel very cheated - though the inclusion of Incineroar and Piranha Plant does seem to undermine the leaked image. None of these will be Echo Fighters. People who purchase the pass will receive a Mii Fighter costume of Xenoblade Chronicles 2's Rex, which will launch on December 7. Ultimate, Nintendo is offering quite likely the strangest fighter we've ever seen as a bonus.