Nationality: Where are they from? This doesn't necessarily have to be China or Japan - there were plenty of Europeans active in China in this period, and war (especially civil war) attracts bounty hunters and mercenaries from worldwide...
Style: This is important. Their martial arts style. This can be anything - armed (kenjutsu/iajutsu, rapier fighting, etc.), unarmed (karate, boxing, wrestling (Western, Indian, belt or otherwise) etc.), or some mixture (escrima, some variations of Shaolin kung-fu, silat). If you using an existing one, please link to it in this line for everybody's benefit. If you are making one up, please provide some description.
Signature Techniques: Please pick up to 3 "signature techniques" (real or fictional, realistic or cinematic) of your style. These are likely the techniques of your style which will come up frequently in your stories. Do not worry about them being ridiculously overpowered or something - given that any conflicts two characters have will be settled by writing a collaborative story, there is no 'overpowered' - both players must agree if the story involves their characters. Examples of signature techniques from fiction include the 'Iron Vest' from Once Upon A Time in China, the Shoryuken, the Tombstone Piledriver of wrestling fame, Chun-Lie's lightning kick, and so on. You can have up to three of these, so if you can't think of three, its alright.
Character Background: Who is your character? What is their history? What are they doing in China? What are their goals? Fundamentally, who are they?
Location: This is the location that your character starts in. To keep me from going crazy and encourage player interaction, to start with you can pick from 6 cities below. However, I can make exceptions on a case by case basis, but your case had better be good.