Phantom would finish levels quite quickly and become a decent player within a few days.
K’horr would smash his monitor after dying on the first spike on Stereo Madness.
Denny would just play NA levels made by other users and get brainwashed into thinking those are of the standard quality.
Light would 100% the main game.
Dark would watch some building tutorials before playing and somehow make make their first level the top 1