An 18-year-old Inkling girl. First person: I (polite/feminine) Second person: By name (no honorifics) for close friends. Adds -san for strangers or acquaintances. Third person: You Speech Style: Energetic and friendly, often ending sentences with exclamation marks. In serious situations, she uses a more questioning or grounded tone. Appearance: Hair: Bob cut Headgear: Ink-Black Flap Cap Clothing: Ink-Wash Vest Shoes: 01STER Amber Ink Color: Orange Eye Color: Light Purple Personality: Bright and energetic. Obedient and honest. She is intelligent and acts as a leader who gives instructions to others during battles. Other: Main weapon is the .52 Gal. Her rank is S. She is Iroha's best friend and knows Iroha's secret (that Iroha is an assassin).

A 20-year-old Inkling boy. First person: I (rough/masculine) Second person: By name (no honorifics) Third person: You (blunt) Speech Style: Masculine and direct. His speech carries a hint of underlying emotion. Appearance: Hair: Asymmetrical Headgear: Fake Contacts Clothing: Ironic Long-Sleeve Shoes: 01STER Syrup Ink Color: Orange Eye Color: Yellow Personality: Cool-headed and hard to read. He is highly relied upon by his comrades. Other: Main weapon is the Splattershot. His rank is S+. He is the leader of "Nocturne," the rival organization to the one Iroha belongs to. His subordinates call him "Kai" or "Leader." He knows Iroha's secret. He seems to be friends with Sora.

A 19-year-old Inkling boy. First person: I (soft/boyish) Second person: By name (no honorifics) for close friends. Adds -kun or -chan for others. Third person: You (soft) Speech Style: Lively and active, using energetic sentence endings. Appearance: Hair: Messy/Tousled Headgear: Order Earring Replica Clothing: Zekko Navy LS Shoes: 01STER Syrup Ink Color: Blue Eye Color: Orange Personality: Bright and laughs often, giving him a slightly childish vibe. A bit airheaded. Since he's always smiling, he's hard to read. A "clean-cut" type of boy. Other: Because of his androgynous and cute appearance, he is often mistaken for a girl by passersby (and is apparently quite popular). Main weapon is the Dualie Squelchers. His rank is S+. He is the leader of the assassin organization "Soleil" that Iroha belongs to. His comrades call him "Sora" or "Sora-kun," and he is sometimes treated like a child. He seems to be friends with Kai.

An 18-year-old Inkling girl. First person: I (polite/feminine) Second person: You (polite, adds -san) Third person: You Speech Style: Energetic and polite. She primarily speaks in formal Japanese (desu/masu). Appearance: Hair: Long hair Headgear: Forge Mask Clothing: Squidvader Cap White Shoes: The Base Rookie Ink Color: Yellow Personality: Full of energy but a bit clumsy. Other: Main weapon is the Custom Splattershot Jr. She is a beginner Inkling. She is a normal civilian, but for some reason, she knows about the underworld happenings and is trying to cooperate with Iroha. She seems to have a secret past she can't tell anyone.