Here's a bio for Ryoko!

Voice Actress: Petrea Burchard

OAV/Universe/Tokyo
Ryoko is certainly an enigma. Monster? Space pirate? Clone? Headstrong and feisty, she is always charging into trouble – or causing it! No matter what she is, she’s powerful and full of mischief. Among her many abilities are the power of flight, teleportation, she can become intangible and can form energy into a sword or energy blasts. Luckily for Ayeka, she has her own powers, or she wouldn’t stand a chance in one of their constant catfights! Despite Ryoko’s gruff exterior, she hides her sensitive nature. Not only does she love Tenchi deeply, she even has a soft spot for the other – perhaps even her greatest rival Ayeka, though she would never admit it. Bonded to her cabbit/space ship Ryo-Ohki, Ryoko is perhaps happiest while flying Ryo-Ohki through the reaches of space – looking for new trouble!

Bio taken from The Official Tenchi Muyo Website