Ogawa is tanned and has bleached blonde hair, her original colour being black.
Ogawa, along with Mifune got jealous of Tomo for spending too much time around Misaki-senpai, they both confronted Tomo but she intimidated them too much. After telling the girls that she'd help them get closer to Misaki-senpai they become somewhat friends. Tomo later tries to get them to confront Carol Olston but they couldn't do it, Carol was too weird for them.
In Omake 1 Ogawa and Mifune both notice how much more Tomo looks like a girl when she's around Jun and blushing.