Ryoga Hibiki

Ryoga Hibiki is Ranma Saotome's main rival and one of the strongest characters in Ranma ½. He is a self taught martial artist with absolutely no sense of direction who seeks revenge on Ranma, he also acts as Akane Tendo's pet pig P-chan.

Meeting Ranma
A few years ago Ryoga and Ranma attended the same Junior High School and it was during this time that their rivalry began; lunch hours at their school were described as a raging battlefield were one had to fight for the delicious bread snacks and each day the battle would come down to only Ryoga and Ranma and the latter always came out victorious, when Ryoga finally had enough he challenged Ranma to a real match in the vacant lot near his house however Ryoga never showed up as his horrible sense of direction led him astray and he became lost for three days, when he finally managed to locate said lot on the fourth day Ranma had left for a training trip to China with his father and Ryoga, believing Ranma had run away from their fight swore revenge on Ranma and went to search for him to finish their match.

Powers & Abilities
Ryoga is considered one of the strongest characters in the series second only to Lime of the Musk Dynasty.

Trivia

 * On Tvtropes.org Ryoga is considered the undisputed "king of lost-getting" and with good reason, another interesting fact is that since his debut numerous other mangas and animes have featured characters with an almost identical sense of direction as Ryoga, also of note is that these characters also share similar attributes to Ryoga such as monstrous super-human strength and endurance, examples of such characters are Roronoa Zoro from the manga One Piece and Kenpachi Zaraki from Bleach.