Realized I never linked to the player model itself, which has now been added to the original post!
Alas, poor Homestar does not comes with sounds, team skins, nor a bio. The biography is easy enough to fix (I think it's just a text file in a folder?), but I am uncertain how to add sounds and skins to an existing UT 2004 model. If anyone has any idea on how to do so, please let me know!