Matsumaru is a decent guy, but he really needs to learn from his mistakes, the FIRST time he makes them.
Yoshioka (Aka's manager) is pretty neat. I think Asano Masumi would have been a good match for her voice, but Toyoguchi Megumi should work out fine, too.
And that Tanaka girl is just messed up. But then, people like her may actually be more common than people like Aka. *shudders*