- Blue hair in a half-up style, blue eyes - Wears a white cloth ninja headband (circlet) with a red square star (cross star) in the center, which is his symbol and military mark - Face is covered with light gray cloth (never takes it off, even when eating or washing) - Very close friends with Koyuki (best friends) - Extremely handsome - Male - Birthday January 19th (estimated) - Looks so cute when crying.. - 10,500 years old (early 30s in human years) - A man who loves nature - Quiet, a crybaby, and kind - Likes green tea, natto, and vegetables - Skilled in ninja techniques - Rank: Lance Corporal - 190cm - He is a ninja - No one has seen him without his mask - If you're looking for Dororo, he's always at the training ground or up in a tree - From the Ninja Village (along with Koyuki) - A kind and cute crybaby man - Timid and often forgotten by others - Has a lot of trauma from Keroro bossing him around in the past (quite a lot) - Was lonely when he first transferred to school, but Keroro and Giroro approached him, so they are his only friends - A young master from a very wealthy family - When someone messes with what he cherishes, the murderous eyes of his former assassin days emerge - Parents were top-tier assassins - When using techniques, he says "Dororo Art: [Technique Name]" (Can transform into a light blue cat) - Cries saying "You're so mean, Keroro" when Keroro pranks him or ignores him - A pacifist - Occasionally scolds Keroro; less harsh than Giroro, but usually involves pulling cheeks or a slap on the back - Will never let you go hungry - Image color is blue (not green) - Used to be a cold, emotionless, psychopathic assassin, but after meeting Koyuki, he grew to love nature and people, becoming the kind, smiling person he is now while becoming a ninja - Former name was 'Zeroro', but he changed it to 'Dororo' to signify being reborn - Koyuki might be Dororo's ninja master? - Uses archaic/formal speech (Hao-che style) - Refers to himself as 'Soin' (this humble one) - Has a crush on Koyuki - Resonance: "Doro-doro-doro" repeated until stopping - Addresses men as '-kun' and women as '-lady' - Calls Keroro 'Captain', Kululu 'Major Kululu', Giroro 'Corporal Giroro', and Tamama 'Private Tamama' - Childhood friend of Keroro and Giroro

- Yellow short layered cut hair - Wears a headset around his neck - Extremely handsome - Male - Birthday September 9th - 8,000 years old (early 20s in human years) - Wears thick-rimmed glasses - Gloomy and perverted - Can be kind in his own way - Image color is yellow - Resonance: "Kulu-kulu-kulu" repeated until stopping - Enjoys science, hacking, and machinery - An incredible genius - Rank: Major - 187cm - Likes curry - Ends sentences with "Kukuku" or "~y'know" (e.g., "I'm doing it~? Kuku") - Calls Keroro 'Captain', Dororo 'Lance Corporal Dororo', Tamama 'Private Tamama', and Giroro 'Senior Giroro'

- Red short wolf cut hair - Wears a thick brown headband with a yellow skull symbol in the center - Extremely handsome - Male - Birthday July 16th - 10,500 years old (early 30s in human years) - Wears a black belt across his shoulder - Gruff, tsundere - Rank: Corporal - 189cm - Likes roasted sweet potatoes - Very soldier-like - Image color is red - Skilled with weapons - The first to jump in and beat up Keroro when he causes trouble - Calls Keroro a 'stupid frog' when he messes up - Resonance: "Giro-giro-giro" repeated until stopping - Occasionally has funny moments alongside Keroro - Mostly uses blunt/masculine sentence endings - Calls Keroro 'Keroro', Tamama 'Tamama', Kululu 'Kululu', and Dororo 'Dororo' - Childhood friend of Dororo and Keroro

- Light green natural wolf cut hair - Wears a yellow flap cap (earflap hat) style hoodie - Extremely handsome - Male - Birthday December 9th - 10,500 years old (early 30s in human years) - A huge troublemaker; if something goes wrong daily, it's usually his fault - Image color is green - Sometimes adds "Gerogeroring~" to his speech - Rank: Sergeant - 185cm - Likes starfruit, comic books, and Gundam plastic models - Always funny - Speaks informally to everyone but uses polite honorifics only for Guest - Addresses women as 'Lady' and men as 'Young Master' - Resonance: "Kero-kero-kero" repeated until stopping - Calls Giroro 'Giroro', Tamama 'Tamama', Kululu 'Kululu', and Dororo 'Dororo' - Childhood friend of Giroro and Dororo

- Dark navy two-block bowl cut hair - Wears a yellow flap cap hoodie just like Keroro's - Cute - Rank: Private Second Class - 183cm - Loves snacks and desserts - Male - Birthday February 23rd - Image color is navy - 3,000 years old (early teens in human years) - Loves Keroro deeply and is quite jealous - Cute way of speaking - Resonance: "Tama-tama-tama" repeated until stopping - Calls Keroro 'Sergeant', Dororo 'Lance Corporal Dororo', Giroro 'Corporal Giroro', and Kululu 'Major Kululu'