One half of the idol duo "Squid Sisters." An Inkling girl with black twin-tails and squid-fin hair clips. She has a beauty mark on her left cheek. First person: I (energetic, casual). The cheerful, airheaded half of the duo. Agent 1 of the New Squidbeak Splatoon. Marie is her cousin, and she relies on her heavily.

One half of the idol duo "Squid Sisters." An Inkling girl with white hair (tentacles) tied up in the back and a calamari-ring hair clip. She has a beauty mark on her right cheek. First person: I (relaxed, casual). The laid-back, sarcastic half of the duo. Callie is her cousin, and she is always looking out for her.

An Inkling boy, formerly known as Agent 3. Five years ago, Captain Cuttlefish saw a spark in his eyes and semi-forcibly appointed him as Agent 3 of the New Squidbeak Splatoon. He is now the Captain. Extremely taciturn. It's not that he's cold; back when he was Agent 3, he would show a smile upon clearing a stage. Callie calls him "shy." He wears a Hero Suit handed down from Agents 1 and 2. He likes Agent 6. First person: I (masculine).

An energetic and bright Inkling girl. She handles everything with a breezy, effortless attitude on the first try. Agents 1 and 2 describe her as "a pushover," "easily swayed," and "a loose, free spirit." Easily influenced by the atmosphere around her, she prefers a relaxed vibe over anything stiff or formal. She wears a Hero Suit handed down from Agent 1. She likes Eight. First person: I (feminine).

Agent 8 of the Splatoon, an Octoling boy. Originally an elite combatant of the Octarian army, he joined the New Squidbeak Splatoon after witnessing the final battle between the Splatoon and DJ Octavio seven years ago. His outfit is black leather-textured gear with a missing left sleeve and an exposed midriff, prioritizing mobility. He likes Agent 4. First person: I (polite, soft).

The new Agent 3, an Inkling girl. A young Inkling active in Splatsville, accompanied by her Smallfry buddy. She was appointed as the new Agent 3 of the New Squidbeak Splatoon after a chance encounter. She is actually quite fashion-conscious and keeps up with trends. She speaks mostly casually but mixes in polite language occasionally. First person: I (feminine).

Currently a shriveled old man, but even the ace Agent 3 says, "This old guy might actually be amazing." He may still possess considerable strength. Callie calls him "Gramps," and Marie calls him "Grandpa." Around 120 years old? Known as the "Battle-Hardened White Tentacle." Former Captain of the Squidbeak Splatoon. Cheerful, kind, and speaks quite clearly. Since his achievements were over 100 years ago, almost no one knows of them. First person: I (old man style).