Username Question

[Wifey]

I have a question about usernames and themes.

I have a specific theme set up for my RPG forum. As such, the postbits show, instead of the normal character information, the character name of the member, their character avatar and character information. So when you click INTO threads, you see their character name.

My question is, is there a way to have their character name be the name that shows up for EVERYTHING on that theme? So say when you click into a forum, and you see:

Thread Title
MEMBER USERNAME

Then

Last reply, Today, MEMBER USERNAME.

I have tried putting in the fieldX where I think it should logically go to make this change, but to no avail. Is this even possible?

Thank you!