Saburo

As of yet, Saburo has only appeared in a single episode... and hasn't even been very prominent in said episode either, having sparse lines. However, he is not changed too much from his original incarnation (like everyone else), and is exaggerated to where he is frequently asserting his self-procrlaimed badassery. Also, he has been compared multiple times to Will Smith, due to being called a "Man in Black" in the original show... and the fact that both of them are badass anyway.

Relationships (Skipping Once Again)
Natsumi - Though they only meet in Saburo/Kululu's debut episode, Natsumi has a crush on him (once again, like everything else), though it's unknown if Saburo feels the same way about her.

Waluigi - Rather than bringing Kululu to the base, he brings Waluigi along and is best friends with him instead. As such, Kululu and Saburo have no relation to one another, let alone a point where they met eachother (for the moment, anyway).