From the anime Tenchi Muyo!, Ryoko is a powerful demon space pirate who is madly in love with Tenchi after he releases her from a seal that had her contained for many years. She has three red gems that are the source of her full energy that was given to her by Washu whom is technically her creator/mother.
Why I like her: Ryoko is the funniest character in the show. She is strong and very powerful when angry. She likes to drink, eat, laze around, and do whatever she wants all the time. She has a very cute cat/rabbit named Ryo-ohki who is a shape shifter. There is nothing more awesome than a spaceship that MEOW'ssssss when going into battle.
Why I hate her: Thought she has a nice side to her, Ryoko is very selfish at times and tends to be a little bit of a crybaby.
Overall: For a great look at one of the series that got anime more known in the western parts check out Tenchi. Ryoko is sure to make you laugh, cry, and possibly make you pretty angry at times too. The Tenchi franchise is pretty big with 3 series, 3 movies and several ova's. The first Ova is what started it all and is the best of them all in my opinion.