Dororo

Dororo is a lazy, apathetic character from Keron, completely uninterested in everything that's going on. He is also completely unaware of any of the other characters, having never met them before his debut episode. Despite usually being seen with the platoon, he is actually not a member, let alone involved in the invasion itself.

History of Characterization
So far, Dororo has had the most changes in personality out of any other characters in the series, due to the writers' block on what to do with his personality, exactly, seeing as his basic personality was mostly implemented into Giroro and the Narrator (coincidentally both of which are voiced by modbz, at this moment). Originally, his character was partially based on his voice actor, Sonicfiend, being made fun of for his editing skills and being somewhat of a black stereotype (such as having an attraction to KFC and KU Laid). Another idea was literally having multiple personalities in every episode or being extremely hyperactive for no particular reason (yet being entirely serious anyway). Various other personality types were implemented, yet RabidSonicFan and MontHenryKnitly recently stuck with the idea of him literally having no personality whatsoever, usually being completely deadpan and apathetic in his delivery, being entirely uninterested about what's going on around him. However, this was slightly explained in Dororo's introduction episode, where it is explained that (unlike the original anime) Zeroro and Dororo are actually two seperate people, with Dororo having never met anyone from the Klan before, with the exception of Kululu...

Relationships
Keroro - They don't have much of a relationship, but he has moreso of a relationship with Keroro than anyone else in the Klan. Keroro (and the rest of the Klan) seem to think that Dororo is actually Zeroro, despite his constant claims that say otherwise. Dororo doesn't seem very interested in any of them, not even bothering to remember their names (usually calling Keroro a different name each time). He often questions why he even hangs out with them in the first place.

Kululu - 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; though Kululu is the only character to actually know Dororo, first meeting him at an unspecified period of time, due to his omnipotence.

Koyuki - Koyuki ended up stowing away in Dororo's house and he let her stay, due to having somewhat of an attraction to her. Because of this, they're often seen together and Koyuki is very friendly to him, despite Dororo knowing next-to-nothing about her... and frequently asking her to take her clothes off.