Sorry for replying to this old comment, and I don't if you know this now, but Takane and Hibiki were originally planned for the arcade game (although slightly different). Miki was made as a sort of combination of the two when they wanted to add an extra character to the console version.
@hate2sayit hmm....quite hard to say in words these two characters are similar in many aspects, e.g: hair style, 3 size, body language etc. It seems like after NAMCO's success with Miki they use the same formula to design this new character
