Assigning different characters to different players in a Multi-Player game

Hello guys! I am making a 3-d multiplayer game for children. I have 3 characters and I want to assign them to three players when they join the room and I choose which character I want to assign to which player. I actually have three prefabs which I want to spawn and assign.I know how photon stuff works plus the scripts and I've seen the tutorials of multi-player fps but couldn't find anything helpful there and nothing on the web yet. Any suggestions or help would be great.