We know that Ryoko laid the egg, that much is implied from the anime, but who is the father? Ryoko herself said it wasn't Tenchi:
As Aeka described her, Ryoko is a "woman of loose morals", which implies that anyone could be the father. But when or where?
In the fandom, there are 2 competing theories:
One is that 700 years back, while Ryoko and Yosho were fighting in space here and there, that before landing on earth, she had a dalliance somewhere. After Yosho trapped her in the cave, Ryoko kept her pregnancy at a standstill, not having enough energy to pull it through nor wanting it to be born into captivity.
The other is that between episode 2 and 3, going by Sasami and Aeka's dialogue, a week had passed, Ryoko, bored, went out and had a one night stand somewhere. Perhaps in space, as it has been shown she doesn't need a spaceship.
While these theories are interesting, none of them answer the paternity question. I have lined up a list of suspects:
1. A Wau
2. Chewbacca
3. Thing
4. An Ewok
All the possibilities are rather creepy though
Icky, Ryoko!
