XF 1.4 Cuztomising usergroups in Xenforo


I'm an admin on a fairly large community, and I'm trying to implement a few cosmetic changes on that forum.

I want to make it so that usernames that belong in certain usergroups have a "modified" username.

Now, what do I mean with "modified" username:

Usernames that belong to usergroup X have their names slightly bigger than the rest and have their names in Bold. I looked online and unfortunately found nothing in regards do username modification.

Is what I'm trying to do possible?

Thanks in advance.