 So you have your own camera, but every time you play the game it spawns a third person character, not a problem. Click your camera, and under Auto Player Activation, set it to Player 0, and now you can see that it's set to the main camera. But it's still spawning the third person character. In order to stop that, right click, create a blueprint class, set it to Game Mode Base. Name it whatever you want, open it, and under Default Pond Class, set it to None. Save, and then under Window, World Settings, and under Game Mode Override, set it to the blueprint you just created. You're done. Hope that helps, and as always, I hope you have a fantastic day, and I'll see you around.