Mulan (known as "Ping" when she is disguised as a man) is the main character from the Disney movie "Mulan". She appears in Kingdom Hearts II as an ally in The Land of Dragons. She has a guardian dragon named Mushu.
When Sora, Donald, and Goofy first arrive in the Land of Dragons, they meet Mushu and catch up with him, and they meet a man named "Ping" who is trying to get into army, which only allows guys (Ping reveals that she is actually a female named Mulan). Mulan wants to carry on her father's legacy by joining in the ranks, so she disguises herself as a male.
Eventually, they are able to get to the training camp, and end up getting into a fight with some of the other recruits. After being rejected by the Captain, Li Shang, Mulan wants to prove her worth by taking on a series of challenges. After they successfully complete the challenges, Li Shang the recruits head out to scout the nearby snow-capped mountains. Mulan reveals to the Captain that she knows where Shan-Yu is.
Eventually they reach a cave that has been overrun with Heartless, and once they escape they manage to cause an avalanche that almost kills everyone. In the mean-time, the entire training camp has been destroyed by Shang-Yu and his army, Mulan is discovered that she is not a man and is throw out of the army along with Sora, Donald, and Goofy. After they overhear Shan-Yu's yell from a far distance they go to warn Li Shang, who in turn, doesn't believe her.
Shan-Yu's companion, Hayabusa, is found soaring over the village and Li Shang realized that Mulan wasn't lying. They dash off to the castle, ready to protect the emperor at all costs.
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Sora, Donald, Goofy, and Mulan manage to save the emperor by defeating Shang-Yu, and in return, the entire population cheers for the heroes. Li Shang and Mulan make up their differences and the emperor presents Mulan the sword of Shan-Yu.