create an empty and put it in your character.
parent the empty to your character.
place your camera behind your player, like in a third person view.
parent your camera to the empty.
put the left/right actuator on the character.
put the up/down actuator on the empty.
link it all to the mouse look script.
so you want to use the first-person mouselook script for a 3rd person view? thats easy to do. it’s nearly the same as a first person view, only that you have the camera a bit higher and behind the player object. be sure to have the UpDown logic on the camera and the left-right logic on the player. in addition you could set the clip-start camera limit a bit higher than it is by default to be able to see your character even if he is standing in front of a wall or other object.
and try a vertical cap amount the fits best for your game.