The ranks followed in Keroro Gunso roughly follows those of the army ranks of the Japanese Empire during World War II.
Officer Ranks[]
Some ranks are shortened.
- Supreme Commander (最高司令官 Saikō Shireikan)
The unnamed Supreme Commander of the Keron Army and highest known authority of Keron itself that has been mentioned in the series.
- Marshal (元帥陸軍大将 Gensui Rikugun Taishō)
- General (陸軍大将 Rikugun Taishō)
- Lieutenant General (中将 Chūjō)
- Major General (少将 Shōshō)
- Colonel (大佐 Taisa)
Colonel, the unnamed leader of the invasion fleet, Keroro's direct superior. He is a recurring character in the manga and also appeared in the anime.
- Lieutenant Colonel (中佐 Chūsa)
- Major (少佐 Shōsa)
Geriri is a Major. Kururu was originally the youngest major in Keron's history before losing his ranking due to insubordination.
- Captain (大尉 Taii)
Captain Keroro, an artificially young Keroro in the anime, or a clone in the manga, receives this ranking due to being purified out of his impurities during the process. Jirara is also referenced as a captain. Keroro calls Aki Captain. Tamama also addresses himself captain in Episode 108.
- First Lieutenant (中尉 Chūi)
Garuru is a first lieutenant.
- Second Lieutenant (少尉 Shōi)
Onono is a Second Lieutenant
- Warrant Officer (准尉 Jun'i)
- Bariri is a warrant officer.
Enlisted Ranks[]
- Sergeant Major/Master Sergeant (曹長/曹長 Sōchō/taichou)
Kururu is a sergeant major. Note: Kururu's rank is higher than Keroro.
- Sergeant (軍曹 Gunsō)
Keroro is a sergeant.
- Corporal (伍長 Gochō)
Giroro is a corporal.
- Lance Corporal (兵長 Heichō)
Dororo and Zoruru are lance corporals.
- Private 1st Class/'Senior Private' (上等兵 Jōtōhei)
Taruru became a senior private. Note: Taruru's rank is higher than Tamama's rank.
- Private Second Class (二等兵 Nitōhei)
- Tamama is a private second class.
Other Ranks[]
- Chief Medic (看護長 Kango-chō)
Pururu is a chief medic.
- New Recruit (新兵 Shinpei)
(new recruit) Tororo and Eruru are new recruits.
- Spy (偵 Onmitsu)
Gyororo is a spy.
- Seamstress (お針子 Ohariko)
Nuii is a seamstress.
Informal Ranks[]
- Private Third Class (三等兵 Santōhei)
- Karara was labeled a Private Third Class by Tamama.
- Captain (大尉 Taii)
Keroro calls Aki Captain. Tamama also addresses himself captain in Episode 108.
- Admiral (提督 Teitoku)
Keroro and the others call Akina Hinata admiral.
- Lowest Grand Sergeant (最低グランド軍曹 Saitei Gurando Gunsō)
Nobibi is a Lowest Grand Sergeant.
- Shogun (将軍 Shougun)
- (general) Keroro once declared himself a Shogun and Chibi Fuyuki has also labeled himself as one.
Group Rankings[]
In Episode 107-A, Keroro explains about Group Rankings. The more people/Keronians you get in your group, the higher up in rank you'll get.
- Army
The Keron Army is the largest known army on the whole planet.
- Corps
The Shurara Corps is the only known corps in the series.
- Brigade
- Regiment
- Platoon
There are a number of platoons shown in the series.