Super Smash Bros. Ultimate

Super Smash Bros. Ultimate is a game in the Super Smash Bros. series of crossover party fighting games for the Nintendo Switch. It was first teased at the end of a Nintendo Direct on 2018-03-08 before being revealed at E3 2018. It is notable for featuring the return of every playable fighter from the series to date as well as many new ones, including an Inkling. The game was released worldwide on 2018-12-07 and is the third-best-selling game on the Nintendo Switch, with 21.1 million copies sold.

Splatoon series representation
Inklings appear as newcomer fighters in Super Smash Bros. Ultimate. They are described on the Super Smash Bros. Blog as follows: "Attacks with a variety of weapons. Covering opponents with ink leads to more and more damage - plus these Inklings are really fashionable!" They utilize the Splattershot, Splat Roller, Splat Bomb, Inkbrush, Blaster, and Slosher for various attacks in their moveset. Inklings switch to their squid forms while dashing and spot-dodging, and utilize them offensively in their pummel, throws, and up special (the Super Jump).

Mii Fighters can also wear custom outfits based on Splatoon characters. The Inkling costume returns from Super Smash Bros. for Nintendo 3DS and Wii U, appearing as the default orange female or blue male Inklings from depending on gender, with the outfit section being exclusive to Mii Gunners and wielding the Splattershot. The standalone green Inkling Squid hat also returns. Additionally, the Splatoon 2 costume debuts, appearing as the default pink female or green male Inklings from depending on gender. Again, the outfit section is exclusive to Mii Gunners and they wield the Splatoon 2-design Splattershot. Mii Fighter costumes for Callie and Marie were released on 2020-06-30 as paid DLC sold separately. They allow Mii Fighters to dress as the Squid Sisters' normal outfits. The Callie outfit section is exclusive to Mii Brawlers and the Marie outfit section is exclusive to Mii Gunners, wielding the Hero Shot.

The Squid Sisters also appear as an Assist Trophy, an item that helps the player defeat opponents. One playable stage, Moray Towers, is also a stage in Super Smash Bros. Ultimate that has original and remixed versions of Splatoon series music that play while players are fighting on said stage.

Spirits from the Splatoon series
Various Splatoon series characters appear as Spirits, characters that can be linked to a fighter and power that fighter up by raising their stats or giving them special abilities. The total list is as follows.

Music from the Splatoon series

 * Splattack! (Remix)
 * Splattack!
 * Ink or Sink
 * Seaskape (Remix)
 * Kraken Up
 * Metalopod
 * Now or Never! - Splatoon
 * Now or Never! - Splatoon 2
 * Ink Me Up
 * Now or Never! (Splatfest Version) - Splatoon
 * Now or Never! (Splatfest Version) - Splatoon 2
 * Octoweaponry
 * I Am Octavio
 * Calamari Inkantation
 * Split & Splat
 * Bomb Rush Blush (Remix)
 * Now or Never! (Remix)
 * Inkoming!
 * Rip Entry
 * Undertow
 * Don't Slip
 * Endolphin Surge
 * Ebb & Flow
 * Acid Hues
 * Muck Warfare
 * Deluge Dirge