I have far too many, but I love them all.
Characters are in the theme of Nazi's vs Marines. This is a package from fps, but I replaced the soldiers and pyros marine models with other ones made to make them lighter (so its basically black vs green). I also have all the GUI for the blue team made green such as sniper dots, cart colors, etc.
Soldier has a black rocket launcher and shoots plasma (blue/green rockets with blue/green gassy explosions)
Pyro regular axe is a guitar (because the axes look too similar)
Demo bottle is Poison Mushroom tonic
Medic heal has a orange or green beam added in (based on team) so the medibeam works for marines ans their green playstyle.
Spy has a shiny gun, sharper knife, and nintendo sapper
Sniper has a high tech sniper rifle, an upgrade smg (though I don't use it anymore) and a Magic fairy wand

Scout has a sword
So ya, the game is completely different, and if anything it makes it harder for myself (Ever try and shoot a black sniper in a shaded room...I have to look for the shades to do it), but I like it