Whenever I create a group, I leave a color on it and check the "yes" box in order to have
the players of my forum who are in that group, get assigned that color.

Here's the Issue:

Whenever I assign a user a color, I'll create a separate group for them
and assign them to that group.

EX: Group Name = White - in order for them to obtain a white colored "forum name"

The problem is.. It'll show up in the legends, and I want to keep that hidden without
the color of the group being hidden as well. I've tried to hide the group, but the color
was removed with it. Is there a way to leave the group "Closed" and have it be hidden
from the legends so that the members of my forum can still get a colored name from the group
without seeing it under the legends?

Here's my forum:
colossus.forum-motion.com

If you look on the bottom the legends down there will say [White] and.. [DR] - Dark Red.
I want to see if I can get those removed from the legends without hiding the group.

Not possible, hidden groups will also hide the color of the members those who are on those group.