HTML markup - force outside of usergroup.
 

How do I force a style in "Currently active users" for a specific usergroup that is set as "displaying" another?

For instance.

Usergroup A has images for ranks.
Usergroup B has images for ranks.
Usergroup C is a mod group

I want to bold the mod group C in the Currently active users at the bottom of the page that could be a member of either A or B. A or B do not have HTML markup styles.

Not sure if I understand the question properly, but I'll give it a shot...

Edit Usergroup C, and add "<b>" in the first box, and "</b>" in the second box of "Username HTML Markup".

Edit a users profile, to make group A or B the users "Additional Usergroup". Primary being group C.