Change StarterCharacter without changing it for the whole server but be visible to everyone?

I'm making a game where one of your abilities is to shapeshift into the last person you killed and I made a serverscript in the player that swaps the StarterCharacter with the new one and then uses :LoadCharacter() but I just realised this will affect it for the whole server and I want to make it change just your player and wanted to use a localscript to do the change but I just realised this will probably make it client-sided so only you will see the change and I want it to be visible for everyone

Well, you're going to want to remove all of the body parts in your character in workspace, like LowerTorso, LeftUpperArm, etc. Once you've done that, you're gonna want to clone the body parts in the character that you killed into your character. Honestly I don't know myself, this is just a guess, but I hope it helps.