that's not currently possible. naotara's (and leon, ein, gen fu, the VF characters, nicole, and neutral jumping) animations and such aren't in the doa 6 game data, and the file formats used by the game changed between 5 and 6. At best we could put her move properties onto somebody else but it would look like shit and it would be an enormous amount of work.
Find out everything you can about the .g1a file format and get back to me when/if somebody knows how to convert the old animations to the new format (or arbitrary animations, i'll take tifa from ehrgeiz if we could lol) and then we can talk about importing doa 5 characters.