Splatoon

Splatoon is a series of third-person shooter video games developed by Nintendo that has crossover content in the. The Splatoon series was produced by Hisashi Nogami, longtime director and producer of the. Beginning in, items based on Splatoon have appeared; three villagers based on Splatoon characters also appear exclusively in. Splatoon crossover content has also appeared in.

Villagers
The following three villagers are based on the Splatoon series and appear exclusively in :
 * Cece NL Villager Icon.png Cece – A peppy squirrel based on Callie. She can be summoned if the Callie amiibo figure is scanned. She is Viché's younger sister.
 * Viché NL Villager Icon.png Viché – A normal squirrel based on Marie. She can be summoned if the Marie amiibo figure is scanned. She is Cece's older sister.
 * Inkwell NL Villager Icon.png Inkwell – A jock octopus based on an Inkling. He can be summoned if the Inkling Boy, Inkling Girl, or Inkling Squid amiibo figures are scanned.

In
The three Splatoon villagers appear in. If their corresponding amiibo figures are scanned, they can be invited to the campground or asked to move in. Their RVs contain items based on the series.

In
While no Splatoon crossover content appears in, two of the three possible catch quotes for the Squid reference the series: These are referaces to Off The Hook, a pop music band, and the speices of the main character, an inkling. Additionally, Blathers's description of the Eusthenopteron fossil references the Splatoon series: "Imagine if we'd not left the oceans... How might fashion and music be different in an aquatic world? How would we resolve differences? Perhaps some sort of ink-squirting contest of champions?"
 * "I caught a squid! It's off the hook!"
 * "I caught a squid! I had an inkling I might!"

In
While no Splatoon crossover content appears in, Octavian's house request greatly references many elements from the first Splatoon game.

In
In, a Splatoon 2 crossover event started on September 13, 2018 and lasted several weeks. Inkling's Splatted Cookie was available from September 13, 2018 to October 11, 2018, giving items from the Splatoon 2 (Fortune Cookie) Set. From September 13, 2018 to September 25, 2018, players could participate in the Blitz Clam Scavenger Hunt event, collecting Blitz Clam (a nod to Clam Blitz) in order to obtain items from the Splatoon 2 (Blitz Clam) Set. From September 19 to September 26, 2018, Chip hosted Fishing Tourney #6, where players could catch Pink Squids, based on Inklings, and Purple Octopuses, based on Octolings, and earn items from the Splatoon 2 (Fishing Tourney) Set.

Triva
K.K. Slider appeared in 2 splatoon concerts, one as K.K. Slider for Splatoon 2, one as DJ K.K. for Splatoon 3.