[Spring of drowned loopers]
That would be an overpowered Ranma since the start with the memories, power, powers, abilities, knowledge, techniques, technology, beings, tresaures, pocket universes of looper! Ranma. Other posbility would fathim stiil changing sexes with his male side a combination of Ranma, Naruto, Harry, Ichigo and Anakin, and his female side one of Ranma-chan, Lina, Usagi, Nanoha and Fate, both sides with all of the mentioned of them above in one Ranma.