Compare/contrast the Character Sheet for the source anime.
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Sergeant KeroroIn the Abridged series, Keroro is a useless, self-absorbed Jerk Ass who can't accomplish anything (big shocker, right?). He occasionally makes an effort to come up with an invasion plan, but sadly his plans wouldn't make sense to a two-year old. Has a fear of being useful, is in a relationship with subordinate Tamama, and is apparently Hispanic. The entire series revolves around his friends and peers wanting to kill him because they hate him so much. Voiced by Mugiwara Yoshi.
Private TamamaTamama is Keroro's adorable boyfriend until he is revealed to be a "she" at the end of Season 1. Tends to act stupid like the rest of the platoon, but occasionally exhibits rational thought. Voiced by ThornBrain.
Corporal GiroroGiroro is Keroro and Dororo's lifelong friend, though he is less than pleased with Keroro's failures and would like their platoon to successfully invade Earth. Has/had a very transparent crush on Natsumi until getting together with and eventually marrying Dororo, and is a transvestite. After the wedding, Giroro no longer wants to invade Earth, and instead just wants to live a peaceful life. Voiced by ThornBrain.
Lance Corporal DororoAfter being stranded in the forest with a broken leg, the lonely, depressed, mentally damaged, socially awkward, unpopular rich kid Dororo became a ninja. He appears to have a form of Stockholm Syndrome in relation to Keroro and Giroro, but his only true friends may indeed by Giroro and Koyuki; nobody else seems to care about him. By Season 2, heaps of Character Development has led him to not take Keroro's crap so much anymore. Voiced by ThornBrain.
Sergeant Major KululuThe biggest personality reversal from the original Keroro Gunsou. Kululu isn't the transparently scheming, constantly-giggling Token Evil Teammate like his counterpart, but is rather an understated, keeps-to-himself, sarcastic, apathetic Jerk Ass. Voiced by Jpace92.
Angol MoisMois is a sweet alien girl with a big crush on her longtime family friend Keroro. As opposed to the original Mois, this character accomplished her mission to destroy the world. Voiced by codeblackhayate.
Fuyuki HinataThe scatterbrained and fairly stupid brother of Natsumi and son of Aki. Keroro may be his only friend, and by the end of the series he is definitely Keroro's only friend. Voiced by ThornBrain.
Natsumi HinataThe girl of the house who is less than amused by the Keronians. She is the center of attention at her school by all of the females, and she wishes she could just have a friend instead of an admirer. Voiced by LillyLivers.
Aki HinataThe mom. She is a manga editor who is so desperate for ideas that she will take anything. Voiced by LillyLivers.
Koyuki AzumayaA cheerful ninja girl with a crush on Natsumi. One of Dororo's few real friends (and Natsumi's for that matter). Voiced by Revy Moonshine.
Momoka NishizawaFuyuki's secret admirer with an extreme split personality. Voiced by Narusasu.
Mutsumi SaburoNatsumi's secret crush. He has a radio show, despite being mute, or at least unable to say a single word without being interrupted.
Other Recurring Characters
Narrator/ThornBrainWriter ThornBrain occasionally acts as the disembodied voice that details the setting of a scene and makes sarcastic remarks. His role as narrator is considerably smaller than the Sgt. Frog counterpart, and he rarely shows up in Season 2.
Chief Medic PururuA childhood friend of Keroro, Giroro and Dororo with something of a loony streak. Arrives out of nowhere to give the platoon checkups, which is just a cover for her to find out the platoon's weaknesses. Voiced by LillyLivers.
Solid SnakeThe main character of the Metal Gear games makes recurring cameos to reference said series. He mostly appeared as a recurring One-Liner gag, but became an actual in-universe entity in Episode 7. Voiced by ThornBrain.
RaidenThe fellow main character of the Metal Gear games has also started appearing in Season 2. He does not reference MGS so much as act like a walking metrosexual Facebook / Twitter feed. Voiced by BigTUnit1.
ViperViper is a half-snake, half-humanoid space pirate with an apparent history with the Keroro Platoon, (he's Dororo's dad). After capturing Dororo and Koyuki in Episode 4, he is relegated to just appearing occasionally as a vocal cameo. Voiced by BigTUnit1.
Future KululuKululu's future self. He is apparently the Kululu we saw from Episode 6 through Episode 10, and the present-day Kululu was trapped somewhere. Kululu turns into him at the end of Season 2, then back to normal in Reset. Also voiced by Jpace92.
HQAn unnamed Admiral in the Keron Army with a lethal loathing of the Keroro Platoon. He dumps the platoon on Earth to get rid of them, only to send people and weapons after them to kill them. Generally speaks in a bored monotone. Voiced by TheSmashBro.
Lieutenant GaruruThe ridiculously friendly, yet surprisingly dangerous, commanding officer of the Garuru Platoon and the older brother of Giroro. He is under the illusion that Keroro is a military genius when he's really a complete idiot, and thus anything Keroro does is mistaken for a brilliant strategy. He and his platoon are sent to Earth to finish off the Keroro Platoon in the event that the Kiruru from Episode 16 did not kill them all; he is not aware that HQ and everyone on Keron are dead. Voiced by BigTUnit1.
Lance Corporal ZoruruThe Garuru Platoon's half-cyborg assassin who kills by using a blade hidden in his robotic arm and speaks in a sneering whisper through a speaker. Being the cold-blooded opposite of Dororo, he is convinced that everyone wants to be his friend and that no one will leave him alone. He has heard rumours that Dororo is indestructible and wishes to prove them wrong. Voiced by ThornBrain
Private TaruruThe Garuru Platoon's frontline soldier who went to boot camp with Tamama and apparently drove her crazy. Voiced by LillyLivers.
Recruit TororoThe hyperactive techie of the Garuru Platoon, Kululu's son, and a big fan of Mint's Hints. He spends his time hacking Kululu's system and laughing maniacally for no reason. Voiced by BigTUnit1.
ShuraraLeader and namesake of the Shurara Corps, and yet another person with a big grudge on Keroro. He has a flair for drama, a very literal mind, and he can be quite mean to his own Corps. Voiced by ThornBrain.
MekekeMember of the Shurara Corps, and Shurara's Yes-Man. Voiced by Vorhias.