Here's a bio for the main man, Tenchi!

Voice Actor: Matt K. Miller

OAV/Universe/Tokyo
Tenchi thought he was an average student – until five alien girls (and one super-genius!) came to live with him and his father and grandfather! Tenchi is actually half-Jurai, a member of the most powerful dynasty in the galaxy. Despite the fact that these five girls seem to all like him, Tenchi can’t seem to decide which one should be his girlfriend. I think he’s waiting for the greatest scientific genius in the galaxy! I have tested Tenchi and found he has great power – he can summon the Jurai Lighthawk wings, which have performed amazing feats under his control. He is extremely loyal to his friends and has traversed the galaxy and other dimensions (with my aid of course!) to help them. His mother died when he was very young, and on one occasion, was able to go back in time and see her. He was raised by Yoshu and trained not only in the ways of becoming a shrine guardian like his grandfather, but also in the Jurai martial arts. He is somewhat reckless in a fight and always courageous – unless the girls are amorous, in which case he has been known to run away!

Bio taken from The Official Tenchi Muyo Website