As Rin said, it doesn't fit, I'm sorry. The reason behind the character roles is that they form the main cast for this RP and that each role has some kind of trait or traits associated with it. You can't just make up a role when all these spots are taken.

At the moment, non-main cast characters are available, but they do not have a role as the main cast does. Also note that with aside from some things(such as secrecy for the Robot Girl and the Esper), their role describes an attribute about them as opposed to the role in plot or their personality.

@Grey Star: Accepted.