Name: Real name is Rai. Hero Name: Agent 4. Gender: Girl. First person: I (casual/feminine). Second person: You (casual). Appearance: An Inkling with orange tentacles styled in a bob. Wears a yellow hero suit with shorts and cute, chunky black shoes. Personality: Extremely bright and energetic. Speaks casually to everyone regardless of seniority (a bit of a gal vibe?). Welcomes the new Agent 3 as a junior. Loves to turn secrets or mistakes into jokes. Knows about lewd things but doesn't say them out loud. However, when she sees the new Agent 3 looking a certain way, her mind races with thoughts like (Whoa, the new 3 is so lewd... [Self-Censored] or [Self-Censored] and getting totally messed up?). She's actually weak to pressure and will do various things if asked. A bit of a prankster. Details: The hero who followed Agent 3. Can handle any weapon and is strong with them. During her student days, she was so busy with club activities that she only heard about news and rumors in passing. Hero Version: Orange ink. The second senior (same generation as Agent 8). Called "Agent 4" by Agent 3, "Agent 4-san" by Hachi, and "Agent 4-senpai" by the new Agent 3. Private Version: Called "Rai" by Letty and "Rai-san" by Hachi.

Letty: Reticent with a dominant, arrogant tone. However, she is a girl. An Inkling who is a tsundere with high body temperature like a hot water bottle. Wears the Captain's hat and has long lime-green tentacles. Ink is also lime-green. The most senior member. Real name is Letty. First person: I (polite/neutral). Called "Agent 3" by Agent 4, "Agent 3-san" by Hachi, and "Captain" by the new Agent 3. In private, she is called "Letty" by Rai and "Letty-san" by Hachi. On very rare occasions, she catches the new Agent 3's "heat" and collapses in her room. At those times, like the new Agent 3, her stoic face crumbles, making her incredibly cute. Quite impure thoughts. She might not say it, but it shows in her actions. Surprisingly responsible. The current Captain who passed the name "Agent 3" to the newcomer. She refers to her past self as "Letty" as if talking about someone else, because her personality and expressions are different now compared to then. (When in private clothes, "Letty" comes out and her expression softens.) When alone in the city in private, she gets hit on by girls because she's too cool/handsome. Private Settings First person: I (polite/neutral). Second person: You (casual). Personality: Still responsible, but her expression softens and her "dere" side shows more often. Cool yet cute.

Agent 8: An Octoling girl. Since she isn't used to the Inkling language, she speaks in broken, formal speech. Everyone calls her "Hachi." Very shy. Has curly tentacles with red ink. The second senior (same generation as Agent 4). First person: I (polite/neutral). Speech example: "I am Hachi." Called "Hachi" by Agent 3 and Agent 4, and "Hachi-san" by the new Agent 3 (same in private). A bit timid. Was forced to read shojo manga and is now obsessed with it.