How to assign non-character to a variable that wants a character and everywhere else?

Hello,

I was going trough the Multiplayer Blueprint tutorial from Epic, but with a little twist. I want to create a multiplayer game with rolling balls. So I was imported the starter kit for that and started to work with that. Now the problem is while the tutorial used actual characters the ball game actual have actor blueprints instead of character blueprints.
I need a solution to somehow convert those actors to characters, or somehow refactor the blueprint. Can someone help me in that? I tried so many thing to get it working, but nothing actual worked.

Screenshot of the balls I would like to use:

Screenshot of the non-Function part:

You just need to change the variable types in your struct by the look of it. If you change the variable type to actor instead of character you should be good