This is Ranma Saotome, the main character of the series. When he was young, Gemna, Ranma's dad, took Ranma on a decade long training mission to improve his martial arts skills. It worked well, but Ranma's personality suffered. As a result, Ranma is a very proud individual and doesn't like to lose or let other people make decisions for him. He wasn't too happy to have a fianceč chosen for him anyway, much less an "uncute" girl like Akane. Constantly insulting her with weak insults like "uncute" and "tomboy", Ranma gets hit more often than he should. The only reason he insults her the way he does is because he really has feelings for Akane, he's just too proud a person to admit it.
Other than his ego, Ranma has another problem. While training in China with his dad, Ranma fell into Nyannichuan, Spring of Drowned Girl. From now on, a splash of cold water turns Ranma into a female version of himself. Ranma hates his curse and is always looking for Nanniichuan, Spring of Drowned Man, an assumed cure. Ranma has gotten used to his curse, and changes into a girl for various reasons that would be too embarrassing to do as a guy (ex. Eating lots of ice cream, learning to figure skate).
Ranma has another curse too, his greedy father. Genma has arranged many other fiancečs for Ranma, usually food or money is involved. As a result, Ranma has Ukyo and Kodachi as fiancečs. The only fianceč he got on his own was Shampoo, and even that was an accident. (See Shampoo's information).
As if Ranma didn't have enough problems, he also is an acute galeophobic, thats is, he is deathly afraid of cats. Why, do you ask? Well, you can thank Ranma's dad for that. When Ranma was young, Genma put Ranma through the ancient training for Cat-fu fighting. It involved straping the trainee in fish sausages and throwing him into a pit full of hungry cats. Genma, unfortunatly, didn't read the next page of the manual, which said that this training was banned as it causes severe psychological trauma. Oh well. The only good side to this problem is that when exposed to cats for too long, Ranma fights the fear of cats by mentally becoming one. In the Cat-fist, he's nearly invincible.