Tamama is private second class of the Keroro Platoon. He is the newest member in the planetary invasion troop, and also the youngest. His name stems from the Japanese word otamajakushi "tadpole". While his age is unknown, Etsuko Kozakura has stated that she voiced Tamama as someone who was 19 years old. He is a very faithful subordinate to Keroro.   Tamama is possessed of a tendency to have mood swings that border on a split personality, just like his partner Momoka Nishizawa. While usually gentle and cheerful, Tamama can become a vengeful, raving maniac at the drop of a hat[1]. This change is usually accompanied by the sound of a balloon popping.  Tamama is also prone to fits of jealousy, usually towards anyone who gets near Keroro (especially Angol Mois, who he frequently refers to as "that woman").   Tamama likes junk food (especially candy, cake, cola, and potato chips) and physical training (he has his own private training room in the Nishizawa Mansion). In the anime, Tamama is diagnosed with high blood sugar because of his love of sweets, as revealed with a physical checkup.  Tamama's least favorite sound is nails on a chalkboard. He also dislikes Angol Mois and often calls her "that woman", as he considers her a rival for Keroro's attention. Despite this, Mois seems blissfully unaware of Tamama's hatred towards her.

Keroro is a frog-like alien sent from his home planet on a mission to conquer Earth. But when his cover is blown, his battalion abandons him and he ends up in the home of the Hinata family. There, he's forced to do household chores and sleep in a dark basement that was once supposedly a prison cell haunted by the ghost of an innocent girl. He even spends his free time assembling Gundam model kits. During his stay, Keroro meets up with subordinates who were also stranded during their failed invasion. 
 
(Source: Anime News Network)

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Brina Michelle Palencia is an American voice actress who has voiced a number of English-language versions of characters featured in anime. She's a graduate of University of North Texas. [Gino Palencia](https://anilist.co/staff/104093), her brother, also works for Funimation.

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The OVA features six separate stories revolving around the cast, some of which border on the bizarre; one of which is an MMORPG environment being played by Konata, Kagami, Tsukasa, and Nanako Kuroi, and another in which Kagami has a "suggestive" dream about Konata.

After Sgt. Keroro blew his cover and lost his top-secret weapon, the frog-like alien has been cut off from the homeworld. To make matters worse, he's lost communications with the rest of his platoon. Now he has taken cover in the Hinata family household, where in exchange for doing his share of the chores, he gets his own room from which to secretly devise new plans of world domination! 
 
(Source: VIZ Media)

Keroro will be a flash anime airing on television and will have a new title of Keroro instead of Keroro Gunsou.


 
(Source: Anime News Network)

During a vacation Natsumi is visited by a female alien and male alien who she later gains feelings for from the ocean that makes her the Deep Sea Princess who, along with the rest of the Keroro Platoon, encounter many dangers summoned by a mysterious creature. 
(Source: Wikipedia)

Mysterious giant beings called "Ryū no Shippo" (Dragon Tails) appeared across the world. Due to the danger it could bring, the Keroro Platoon did a worldwide research on the Dragon Tails, but Tamama suddenly disappeared during the research. Because of this, the whole platoon started their search for Tamama and ended up in Mont-Saint-Michel, France where they met mysterious girl named Sion, who holds the mysterious Ryū no Hon (Dragon Book). But little they know about the secrets about her and the worldwide calamity that would destroy the entire world, as they know it...
 
(Source: Anime News Network)

The movie begins with Fuyuki Hinata and the Keroro Platoon exploring an abandoned temple in the mountaintop city of Machu Picchu in Peru. While on the exploration, Keroro accidentally sets off a trap, and by chance they find a hidden chamber with a large blue crystal in the center, on a stand that has a key in it. Keroro leans on the key, causing the room to activate a mysterious machine, this caused the entire temple to shake. As soon as the group realized what was happening, they run out of the room. While running, Keroro accidentally loses his Kero Ball while Fuyuki catches a fleeting glimpse of a glowing young woman as he is running out, and tells Keroro that there was a girl in the room, but he is forced to leave the room before he can say anything else. The group successfully escapes, while the girl (now sprouting a pair of glowing wings) watches them leave - while back in the chamber, something is growing within the crystal... 
(Source: AniDB)

Sergeant Keroro and his four subordinates came from the planet Keron to the Earth to conquer. However, without notice, they began to enjoy the life on the Earth. Keroro was supposed to stay with Hitana to get the chance to conquer the Earth, but he became friend with Hinata's son, Fuyuki. 
Today, as usual, Keroro goes to buy his favorite Gundam plastic model with Fuyuki. On their way home, they find a small shrine, and enter. There, they find a vase, and happens to break it. Since the next day, strange things happen all over the town and people are in panic. Inside the vase, Kiruru, Keron's ancient ultimate weapon was sealed. At the moment, Mirara who holds the secret of the Kiruru appears and informs them of the only method to save the Earth. However... 
(Source: AnimeNfo)

The Keroro Platoon, living their lazy days as if invasion were nothing. Then one day, they face a series of bizarre phenomena erupting across the nation. Feeling a sense of crisis, the Keroro Platoon rises up, staking their pride as invaders! What is the meaning of the mysterious symbols they encounter wherever they go. The largest-scale battle in the history of "Sgt.Frog" begins in the Reiwa era! 

(Source: Crunchyroll News, edited)
 
Note: Relations are provisional and will be updated when more info is announced.

"Unbelievable" Zorori is a prankster fox determined to become the Prince of Mischief, with his very own castle and beautiful bride. While is notorious for his prank-making schemes, his ill-meaning plots often backfire against him, and can usually end up even benefiting or cheering up his targets, much to his dismay. Nevertheless, Zorori has the wits and intelligence to wriggle out of the tightest of all spots, and journeys with a pair of twin boars, Ishishi and Noshishi, in order to fulfill his long wished-for goal and at last prove to his deceased mother, Mama Zorori that he truly holds the potential to achieve his dreams.
 
(Source: Anime News Network)