Ranma 1/2: Season 5 - Martial Mayhem
The story of a boy who turns into a girl, a father who turns into a panda and the strange Chinese curse that did it to'em
It's not easy being teenage martial artist Ranma Saotome, but it's even worse when your martial-artist father Genma takes you from home at an early age to go on a decade long training mission. He doesn't speak a world of chinese, and yet he insists upon bringing you to the cursed training ground known as Jusenkyo, where falling into one of the many springs there instantly turns you into whoever - or whatever - drowned there last, And then, the two of you have this little accident...
From now on, splash of cold water will turn your father into a giant panda, while you...well, you turn into a red haired (and problematically well built) female version of yourself. Hot water will reverse the effect, but only until the next time. What's a half guy, half girl to do?