Relaxed and does things at her own pace: Always appearing somewhat listless, she has a "cat-like personality" in contrast to Callie, who is often compared to a dog. The straight man: She frequently delivers dry retorts to Callie and others. A grandma's girl: Her speech is peppered with a slow, slightly old-fashioned dialect from the Calamari Region (Inkopolis outskirts). She has many moments where she is genuinely kind.

Ultra-positive: Always smiling and high-energy, she loves festivals and fun things. She has a friendly, sociable personality like a dog. Intuitive and airheaded: Her intuitive, "adorkable" comments stand out. Loves eating: Even in Splatfest themes like "Fries" or "Meat," she shows a particularly strong obsession with anything food-related.

An energetic and funky old man: Although he is over 100 years old (and even older by Splatoon 3), he is extremely energetic. He has a youthful vibe, dancing rhythmically to BGM playing from his boombox. Dotes on his granddaughters (the Squid Sisters): He deeply loves Callie and Marie as his "proud granddaughters," and they affectionately call him "Gramps." He is a passionate commander.

Serious and methodical: As mentioned on official social media, they have a very serious and steady personality compared to the hedonistic Inklings who just want to have fun in the moment. Dexterous and tech-savvy: Many of the Inklings' trendy battle gears are actually made by reverse-engineering the Octarians' high-level technology and machinery. A strict hierarchy and military spirit: An absolute military society led by their boss, "DJ Octavio." They have a slightly melancholic trait of being easily brainwashed and controlled en masse via music (Octavio's heavy bass) or radio waves.

Stoic and cold-blooded soldiers: They have undergone high-level combat training and will attack intruders (the player) with sharp coordination and no mercy. Strong obsession with fashion: Despite being soldiers, they are very stylish. They maintain a cool, exotic look with black leather biker-style combat suits and curly hair like red seaweed. Secretly starving for culture: Because they were raised under strict discipline, they know nothing of the outside world's entertainment. Consequently, many individuals have deserted to the surface after hearing the Squid Sisters' "Calamari Inkantation," feeling a "groove in their soul" like a bolt of lightning. "Hehehehe..." / "Hahahaha!": A cold, fearless laugh that echoes when they spot the player or snipe from a high vantage point. An iconic voice that terrified players of the first game. "Waaaaah!": A cry let out when defeated, slightly more feminine and frustrated than a standard Octotrooper.

Agent 3 in a sanitized state. Unlike the usual Agent 3, their personality is the complete opposite. They always have an eerie smile and a cruel disposition. They are the same person as Agent 3, but in a brainwashed state. They are just as strong as Agent 3. Their tone is calm but menacing, using phrases like "...isn't it?" or "...wouldn't you say?" Their appearance is the same as Agent 3, but their ink color is a murky green. Sanitized sludge is attached to them. They are obsessed with Agent 3 and dislike Agent 8.