Kaolla Su's older brother, only appears in the anime.
He is the "Big Brother" to both Amalla Su and Kaolla Su. However, he really is a cousin of theirs, but they have grown up as if they were siblings. He is the king of Mol Mol, and in the tradition of their people, he has to serve in the military for some time. Before that happens, he is required to marry. Once when Kaolla Su was a very young girl he promised to marry her, but then he realizes that she only sees him as a brother, whereas Amalla is in love with him. He marries Amalla instead.
Ramba Ru looks almost exactly like Keitaro Urashima when they both have their glasses on. The only differences in appearance are that he is more tanned than Keitaro is, has darker hair and dark green eyes, and a somewhat Indian appearance. Unlike Keitaro, however, Ramba Ru is very calm, collected, and 'together', and not at all clumsy or awkward.