Demoman Secondary : "The Shartin' Charge"
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=268161081
[+] Alt-Fire - Demo gets explosive diarrhea, giving him afterburn and bleed damage, bashing into enemies results in them getting afterburn as well.
[-] When charge is completed, Demo dies


Pyro Primary : "The Crackburner"
Same model as BackBurner
[+] 100% Critical Hit against Invincible Enemies [Bonk/Über]
[-] -30% Damage Penalty

Soldier/Demoman Melee : "The Pain (of being a) Train"
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=339007708
[!] Alt-Fire - User dies, Ragdoll turns into a train
[-] -30% Resistance to Enviromental Hazards

Engineer Melee : "The Immature Joke"
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=283993549
[+] Replaces Dispenser with Grillspenser
[-] Grillspenser bursts into flames every 10 seconds

http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=260806521
[+] No move speed penalty while scoped
[+] Can use scope while airborne
[-] -33% Less damage increase from Charge (Fully charged headshots only deal 300 damage, Bodyshots only do 100)
[-] -15% Fire Resistance

To be honest, I never get any teams that have more than 2 of one class. Then again, I play on the Luxembourg server and there are never more than 6 people on that one.