Return of Reckoning

Fairly new to addons! I'm looking for this particular addon where you can see the class icon above the players head.

Any idea of what's it called?

I believe that's part of Enemy.

Under the enemy addon, go to Configuration -> Group icons. There you can tick/untick boxes to match your preferance.

There also is the GroupiconsSG addon but i would not advice using it since it's relatively buggy and cannot be adjusted, for me at least.