If you spawn the Characters, you don’t need the LevelBlueprint.
Like @mikepurvis said, save the actors into a list (Array) directly after spawning.
Then you can setup a simple switch Pawn system in your “PlayerController” that just
gets the Array from the GameMode.
Normally, you don’t need the LevelBlueprint/GetAllActorsOfClassNode in your game.
If you use it, you should think about a proper way to 
(which is what you do with this thread, so thumbs up!)