Hello @WillMead13,
Unreal Engine’s depth-of-field blur effects only are applied with the CineCamera component. You will need to change the Camera component in your blueprint to be a CineCamera component instead.
If set up properly, you should be able to get a nice blur in the foreground and the background, with the focus on that character. UE’s Bokeh and Circle blur effects produced by the CineCamera will also be more realistic than a simple guassian blur.
This may help you use the CineCamera component: