Super Smash Bros. Ultimate

Super Smash Bros. Ultimate is a crossover Nintendo fighting game released on 2018-12-07 internationally and directed by Masahiro Sakurai. It is the fifth installment in the Super Smash Bros. series (sixth if both the Wii U and 3DS versions of Super Smash Bros. 4 are counted separately).

ARMS-related content
Several characters and elements from ARMS make cameos in-game with different roles as well as a future playable character on the horizon.


 * Spring Man appears as a computer-controlled helper known as an Assist Trophy. He punches fighters using Toasters and uses Rush after hitting an opponent.
 * Mii Fighters can wear an outfit based on Spring Man and Ribbon Girl, complete with their signature Toaster and Sparky gloves.
 * Spring Man Ribbon Girl, Ninjara, Min Min, and Twintelle appear as some of many collectable, stat-boosting Spirits.
 * An unknown ARMS fighter will join as a playable character as the sixth Challenger Pack in Fighter's Pass Vol. 2, scheduled for release in June 2020. Like other Challenger Packs, this will include the fighter, a stage, music, & spirits.

Trivia

 * Each of the Spirit battles are references to characters and elements in ARMS:
 * Spring Man's Spirit battle has a Mii Brawler wearing a costume based on him in the Boxing Ring stage, possibly as reference to Spring Stadium. The song that plays during the fight, "Title Theme - Wii Sports Club", which may be a reference to both the musical similarities to ARMS' soundtrack as well as Wii Sports Club featuring Boxing as one of several game modes.
 * Min Min's Spirit is represented by Corrin. She often uses Dragon Fang Shot, an attack that involves turning her arm into a dragon much like Min Min's default ARMS, Dragon. The stage is set in New Pork City, which may be because it resembles a China-themed setting. The music that plays is Dragon Driftway from Mario Kart 8, a game that was also produced by Kosuke Yabuki.
 * Twintelle's Spirit is represented by Bayonetta, who tends to use Smash attacks. Both Bayonetta and Twintelle are known to use their hair in battle and can both slow down attacks. Bayonetta also starts the fight with a Drill which bares resemblance to Twintelle's default ARMS, the Parasol. The stage is set in New Donk City Hall, which bears resemblance to Cinema Deux.


 * In an interview with Nintendo Dream, series director Masahiro Sakurai confirms that because the base roster was completed prior to the announcement of ARMS in January 2017, a playable fighter from ARMS wasn't able to make it into the base roster of Ultimate. However, the addition of an unknown ARMS fighter to the game's roster was revealed as the first character in the second Fighter's Pass on March 26th, 2020.