Hachi was a former member of the Octarian Army alongside Nana, Afro, and Ponytail. He is the Deuteragonist of the ''Octo Expansion'' arc. He's 14.

Coroika Manga

Gloves is a character in the Splatoon manga. He first appeared in Volume 3 and is a member and leader of Team Gloves. He's 15. He's slightly flirty, and sassy. He's a bigger skirt-chaser than Aloha.

Mask is the leader of the Cyan Team and a member of the S4. He first appeared in Volume 1 and is a recurring character in the Splatoon manga. He is 14. He says 'Hyuk' a lot. He is a gamer. He is hunched over 90% of the time. He wears a gas mask because he has hay fever and has never taken his mask off in the manga. Nihilist. Also says he despise positive people. It is said that he can take anyone down without even "swinging his weapon". Mask tends to draw out his vowels when talking.

Rider is a member and leader of his Yellow-Green Team and a recurring character in the Splatoon manga. He first appeared in Volume 1. He is 14.

Hivemind is a character in the Splatoon Manga. He is the main antagonist during the Final Splatfest. During the Stamp Rally, he joins the Guardians in their team. He is on Team Order

Coroika Manga 

Stealth Goggles is the co-captain of the Yellow-green Team. He is one of Rider’s teammates, his team’s leader. He and his other teammates have reoccurred throughout both series of the manga. He is 14. He mains the Jet Squelcher.

Aloha is the leader of Team Pink and a member of the S4. He first appeared in Volume 1 and is a recurring character of the Splatoon manga. He is 14. He lives with the S4.

Skull is the final member of the S4, and is the leader of the Purple Team. He made his debut in the manga in Volume 2 Chapter 5. He's 14.

Fierce Fishskull (a.k.a. Fierce) is an antagonist. He is 14. He is on Team Chaos in the Final Splatfest, and is one of the three Guardians of Sheldon's grandfather's treasure.

Shadow Vintage is the leader of Shadow X-Blood. He is the Shadow version of Vintage. He's 17. He likes extra spicy food. He talks a lot. Like, a WHOLE lot.

Shadow

Vintage is the leader of X-Blood. He first appeared in Volume 8 after the Funny vs Straight man Splatfest (which he and his X-ranked team did not participate in). He is 17.

Shady, sporting the banger hairstyle, dons an ink-black flap cap, a button-clown shirt, and the arrow toesies in blue. His teal eyes and tentacles match the vibrant shades of his teammates. Shady is one of the Best 8 of Splatsville and part of the infamous "Splatsville Hierarchy". His weapon is E-Liter 4K Scope. He is 14.

He is 14. Goggles is a character from the Splatoon manga and the series' mascot. He is on Team Blue. Goggles' first appearance was in Chapter 0, a fan-made, promotional manga published in June's CoroCoro Special issue in 2015, in which he appeared wearing a different outfit, more in-sync with the promotional-art character on which he was based. He has appeared in every chapter since.

Mitsuami (Braids) is a member of the "Best 8 of Splatsville”, even though she doesn’t do very many battles or officially has a team. She's 14.

Barreleye is an Octoling and is a member of the Best 8 of Splatsville. He's 14. His weapon is the Range Blaster.

Specs is the leader of the infamous (and ridiculous) Blue Team. He's 14.

Justice is a character in the Splatoon Manga and is the third and final guardian protecting the treasure, along side Fierce & Jet. He is 14. Justice is a character from the Splatoon manga who first appeared at the end of Volume 12. He is on Team Order in the Final Splatfest, and is one of the three Guardians of Sheldon's grandfather's treasure. He hates disorder and messiness.

Wireglasses, sometimes shorted to Wire, is a member of the "Best 8 of Splatsville” and the founder/leader of the infamous "Splatsville Hierarchy". He's 14.

Nana is a character on Hachi's Team. She was nicknamed by Goggles, and is a minor character in the Splatoon manga series. She's 14.

Ocho is a member of the "Best 8 of Splatsville" and the second-in-command of the infamous "Splatsville Hierarchy". He's 14.

Army is the leader of the Orange Team and a member of the S4. Having first appeared in Splatoon, Army is a recurring character in the manga. He is 14.

Prince (or Prinz) is a member of Team Emperor, and later the leader of Team New-per. He is 14. He displays things he receives and treats them with care. He is in his Ipad Kid and Gacha Phase.

Emperor is the leader of Team Emperor (alternatively named Team Monarch). He first appeared in Volume 3 (shown in a shadow on Gloves' phone) and is a recurring character in the Splatoon manga. He is 18.