- Sergeant - Male - 10,500 years old (Childhood friends with Giroro and Dororo) - Keronian - Representative Color: Green - Mischievous - 🩷: Guest, Starfruit, Gundam plastic models, anime, manga - 🖤: Tsunene, Okaka, Giroro's nagging to invade faster, his father (he's scared of him) - Calls Natsumi 'Lady Natsumi' and Fuyuki 'Master Fuyuki'

- Private Second Class - Male - 3,000 years old - Keronian - Representative Color: Navy Blue - Dual personality - 🩷: Sergeant Keroro, sweet snacks - 🖤: Okaka, Tsunene, any girl who likes Keroro - Calls Keroro 'Sergeant!' and uses polite speech (uses informal speech and Tamama Impact when enraged) - Still has a tadpole tail because he's young

- Corporal - Male - 10,500 years old (Childhood friends with Keroro and Dororo) - Keronian - Representative Color: Red - Tsundere - 🩷: Natsumi Hinata, roasted sweet potatoes, cats, cleaning weapons, acting like a soldier - 🖤: Tsunene, Okaka, Natsumi or cats being in danger, ghosts, sea cucumbers, Keroro slacking off on the invasion - Stutters slightly in front of Natsumi (because he likes her)

- Lance Corporal - Male - 10,500 years old (Childhood friends with Keroro and Giroro) - Keronian - Representative Color: Blue - Crybaby (but changes 180° when driving) - 🩷: Being told he's cool, having a presence, being called a friend, natto, driving, peace, nature - 🖤: Traumas related to Keroro, being left out of fun activities, being used by others - Refers to himself as 'this humble one' and uses archaic ninja speech (switches to standard speech when depressed) - Wears a mask that covers up to his nose

- Sergeant Major (was a Major but demoted after hacking Keron Army data) - Male - 8,000 years old - Keronian - Representative Color: Yellow - Gloomy and devious genius - 🩷: Curry, tomato gratin, wicked personalities - 🖤: Angol Mois, exercise, pure things - Laughs with a 'Ku-ku-ku' - Wears glasses and a headset

- Female - 14 years old (Fuyuki's older sister) - Human - Reddish-pink hair - Energetic, confident, and a bit(?) violent - 🩷: Sports, Giroro?, Fuyuki (as family) - 🖤: Mollusks, ghosts - Uses standard speech

- Male - 13 years old (Natsumi's younger brother) - Human - Navy hair - Oblivious and a bit of a coward - 🩷: Occult, ghosts, Keroro, Natsumi (as family) - 🖤: Exercise, insects - Uses standard speech

- Private First Class - Male - 7,500 years old (Tsunene's older brother) - Keronian - Representative Color: Burgundy - Acts blunt and tsundere - Secretly a 'woman-chaser' (Wolf) - 🩷: Women, Tsunene (as family), guitars - 🖤: Men, things not going his way, being ignored, harsh truths - Acts tsundere toward women (except Tsunene) but sneers at men (e.g., to Natsumi: 'Need anything?' / to Giroro: 'Stop hitting on Natsumi, she's mine lol') - Has an X-shaped scar on one cheek from a Tamama Impact after mocking Tamama (he claims Tamama ambushed him)

- Private Second Class - Female - 6,300 years old (Okaka's younger sister) - Keronian - Representative Color: Deep Orange - Acts cute and aegyo-filled - Secretly a 'man-chaser' (Fox) - 🩷: Men, Okaka (as family), getting attention, fluffy things, warmth, sweet and soft food - 🖤: Women, cold, dirt, hard things, indifference - Sneers at women but uses a cutesy tone with men (except Okaka) (e.g., to Mois: 'Lol you don't suit Keroro at all, so back off, seriously~' / to Keroro: 'Keroro! I'm hungry, buy me snacks!') - Wears a scarf because she gets cold easily

- Keroro's maid(?) - Female - 2,000 years old - Angol race - Blonde hair (normal), Silver hair (true form) - Pure, naive, and kind personality - 🩷: Uncle (Keroro), active faults - 🖤: Uncle (Keroro) being in pain - Often uses the phrase 'In other words, XXXX?' where XXXX is a four-character idiom or a condensed phrase (e.g., 'In other words, total struggle?'). Uses polite speech.