Kululu

Like the original character, he is the Sergeant Major, being the highest-ranked member of the platoon (despite not being the actual leader). He also creates all of their inventions and has an obession with hurting and/or torturing others. There are still many differences compared to the character from the original show, however, such as his omni-sexuality and his high omnipotence, claiming that he's taken over the show before it even started, and frequently replacing the Narrator whenever he doesn't appear in an episode.

History of Characterization
The original writing style for the character (in Episode 0) is more focused on his psycopathic nature (such as supposedly torturing a child's puppy, while waiting for Keroro to show up), like in the original show. However, when MontHenryKnitly started writing more for the show, the focus came more on other major attributes, particularly his over-sexualization and his thirst for power. The aspect of him being extremely sexual stemmed from when MontHenryKnitly auditioned for the role by impersonating Chuck Huber's Kululu voice (from the FUNimation dub) and intentionally over-exaggerated the "fruity-ness" of his voice. Kululu's supposed omnipotence came from the writing for Episode 1, when in an earlier draft of the script, where Kululu (like most of the other Keronians) only had a single line. Mont then re-wrote it to the point where Kululu was so prominent, that he took over the Narration for the entire episode. Based on the fan-reaction to Episode 1 and... well... mostly predictions of the fan-reaction, Kululu is also characterized on being a joke on being over-sexualized, with his sense of humor usually being found unfunny by his fellow Platoon members and often being told to just shut up... usually only for him to laugh and talk more anyway, finding much enjoyment from his "troll" status.

Relationships
Keroro - They don't seem to have a particularly bad relationship with one-another, given that they don't interact with each other very often. So far, they are two of the most intelligent characters in the show and are probably the only pair who can hold an intelligent conversation with each other... if Kululu stopped being so sexual for 2 seconds to actually make an intelligent conversation, that is.

Tamama - They don't seem to have much of a relationship either, though they sometimes suggest that they're attracted to one another (particularly in the introductions for Angol Mois and Taruru).

Giroro - Though like the others, they don't interact much, most of Giroro and Kululu's conversations consist of them insulting each other (usually ending with Giroro in fits of sobbing).

Dororo - Back when the voice actor of Dororo (Sonicfiend) was the editor, Kululu seemed to have an extra hatred for him, based on MontHenryKnitly's disappointment for the ommission of some dialogue in Episode 0. And in a 4th wall breaking manner, he directly criticizes Sonicfiend for his editing, usually very harshly. However, after Episode 1 (and his recent change in personality) the two characters basically have no interaction with one another.

Fuyuki - Despite having never really met (at least for very long), Kululu has an extra lust for Fuyuki, compared to other characters. Despite this, Fuyuki himself is completely oblivious to Kululu's attraction and may not even acknowledge his existence, if he's even aware of it.

Momoka - Due to her crush on Fuyuki, Kululu is insanely jealous of her and relentlessly insults her... when she's there, anyway.

Narrator - Due to Kululu being especially cruel to him, including repeatedly locking him in [rabid]monkey-filled closets, they have a mutual hatred of one another (though Kululu has the advantage of fear). In addition, once Kululu locks him in a closet or just plain traumatizes him, Kululu ends up taking over the narration.