Hello, while its not the nameplate my addon
Player role indicator adds icons above players.
I intended to add a feature soon that would allow you to make custom roles, such a feature would let you put an icon on a specific player in the group.
So if player X was the person you intend to guard, you could add them to this role and see an icon at/above their position.
While I cant make any promises I intend to implement this feature by/on this coming Monday.