Just some more ideas I had on me
Grabber Blast- it pulls players towards you insted of blasting them away
The commitment- medi gun that binds you to healing target matching your health to his so if he dies you die
The covert action-when ever you get a backstab the player that got backstabed respawns as your team heavy for a few seconds
Shotgun wedding- when ever a building is being sapped the spy gets marked for death and canot move intil the building is destoryed
The fishing trip- for every bat hit you gain a bait and when you right click for how many baits you have you might spawn hhh (1 bait is like 1%)
Pyros Tea Party- when ever someone is drinking tea(set on fire) you get more happy(deal more dmg) but when someone stops drinking tea(gets put out) you get sad (deal les dmg)
Sollys art of war- when you get full rage all enemies get marked for death and highlighted near you intill the rage runs out
Snipers spy revenge - when ever you hit someone in the back its a critical
Craftings crafty time (all class)- when ever you meele someone they get locked to meele and get forced to look at you( and so do you)