Ranma ½ Series by Rumiko Takahashi

Follows the adventures of half-boy, half-girl martial artist Ranma, whose transforming gender problems began at the Accursed Springs in China when he became cursed to turn into a girl when splashed with cold water, and back into a boy with hot water.

From the best-selling manga author of InuYasha, Ranma 1/2 features a martial artist with a curse: When he gets doused with cold water, he turns into a voluptuous girl. His friends--and enemies--turn into various cute animals due to a curse similar to Ranma's. Ranma 1/2, which features action, adventure, and romantic comedy, is the longest-running manga in the United States... moreFrom the best-selling manga author of InuYasha, Ranma 1/2 features a martial artist with a curse: When he gets doused with cold water, he turns into a voluptuous girl. His friends--and enemies--turn into various cute animals due to a curse similar to Ranma's. Ranma 1/2, which features action, adventure, and romantic comedy, is the longest-running manga in the United States. In this entry, Ranma in female form engages in a gymnastic duel with the duplicitous Kodachi, Kunou's younger sister, who has fallen in love with the male Ranma. Like her brother, she refuses to see that the two Ranmas are the same person. Next up is an ice-skating duel. Skater Azusa, who collects "cute" things, wants to wrest P-chan away from Akane, who won't give him up. Worse still, Azusa's male partner Sanzenin kisses female Ranma--which aggravates Ranma no end since it's his first kiss. When the Ranma and Akane team up against Azusa and Sanzenin, the prize is P-chan less

First Ranma & Co. enjoy a trip to the beach, despite all the COLD WATER. Then, camping out in the woods turns out to have a lot of hazards, not the least of which is the toxic cooking of Akane, Ranma's reluctant fiancee.... Finally, Ranma competes in two bizarre tests of skill. Who will triumph in the Anything Goes Martial Arts Tea Ceremony and the no-holds-barred Martial Arts Fast Food Restaurant Takeout Race?