To cut to the case I am creating an ARK mod. I’ve replaced the character 's skeletal mesh with a plane which rotates towards the player in order to display the 2D texture correctly. So the solution I was seeking wouldn’t have worked.
The best I can think of right now is determining the angle from two points, but I would need to store a previous Actor Position in order to calculate the angle between the two points. Is there a way to store variables in a material?