Making a mesh set to "always visible"?

Hi,

I am attempting to make my character stay visible when moving behind walls (top down view, 45 degree angle). I have a blueprint for changing the opacity of the meshes that cover the character when it moves behind them, but I figure that making the character itself always visible, or giving it an outline or something similar might be better (as I am currently dealing with the problem of all the meshes with a set tag being hidden instead of just the ones the character is behind).

Does anyone know if something like this is possible with materials or the mesh itself?

e: I solved the problem of hiding specific walls through this post: How do you handle visibilty in a TOP-DOWN Game? - Rendering - Epic Developer Community Forums

There has been a UDN artcile on how to do this in UDK. Maybe you can adapt it to UE4.

http://udn.epicgames.com/Three/DevelopmentKitGemsRenderingOccludedActors.html