Ryoga Hibiki
The Eternally Lost Boy, Ryoga! He loves akane, and he turns in to the cute little piggie above! The only reason he ever puts up with being a pig, is because its the only way he can get close to Akane. Akane, totally oblivious to the fact that Ryoga changes into something, found the poor little piggie and named him P-Chan (P for pig and Chan for little) and now she sleeps with him almost every night. Ryoga blames his transformation on Ranma, who accidentally knocked him into the Spring of Drowned Black Pig. Which, it is, on account of the fact that it was him that knocked him in.? Ryoga was chasing Ranma because he ran out on their man-to-man fight (even though, he did wait 3 days for Ryoga to show up). Ryoga followed him to China, where, as you know, Ranma and Genma are turned into a girl and a giant panda. Ryoga doesn't know about their curses at the time, and he gets knocked into the spring by Ranma when he is a she.