This simple plugin let's you change the display name of the group field, per-member. Assigning member-specific group names saves the dilemma of whether or not to create a new member group for a single member.
*The titles are formatted the same as the member's group, only the text will read differently.
After setup, a new field will appear under the 'Profile' tab, in the member editing area of the ACP:
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Left: before / Right: after
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Likes: Skree and Maxs