I’ll go first.
Outlaw rogue leans into the cowboy aesthetic and starts using guns to shoot from afar. Stealths, goes from behind, and shoots up close. Has 2 abilities that effectively use a non equipped pocket knife.
Gets extra energy from transmogs. The bigger the hat, the more shiny the belt, the bigger the returns on energy.
Steals monks swagger, but requires a cooldown and bourbon.
Your turn: break a class.
I steal Demon Hunters’ Metamorphosis ability and give it to war…riors.
Mages that were frost are now water benders, but are not useful and can only make peaceful rain with healing properties
imo they broke outlaw rogue when they made it a pirate spec.
Anyway Hunters now have to keep a leash on their pets in case they run off mid-fight.
Let’s break them all, give Warlocks every other class ability in the game and leave the other classes just with auto attacks.
I can tame a raid boss in mid combat during raid. Humanoids included.
Feral turns into a gun that the outlaw rogue uses as the hunter dismisses it’s outlaw rogue pet
Evokers hibernate ever winter season
Paladins.
Nothing changes.
Except they equip pool noodles instead of hammers.
Demon Hunters can see again, but everything is puppies and rainbows.
Come to think of it it is weird that shamans heal by throwing water at you.
Like on no ive been biten by a dragon and some shaman runs up with a super soaker goin dont worry i got you
Pretty sure im just dead in this situation
Enhancement shamans can only be males, their totems are now oddly phallic and, after being summoned, persist for 4 hours.
Demo Warlock has lost their summons!
We are back to Vanilla and farming soul shards before raids/dungeons, only now it’s imps!
You must collect enough imps before each instance to summon during said instance. Otherwise you will run out as though they are a limited source of ammunition.
In addition to this imps are now a rare spawn that randomly spawns in a single zone, one at a time, and could require travel from Icecrown to Un’goro from spawn to spawn.
Can I just go look at the alpha trees, or is that cheating?
Holy Priests now heal by slapping their target.
This doesn’t require changing any ability icons.
I miss the Sepulchur raid season. The shadow priest tier leaned heavily into our mindflayer, so much so that damage meters registered most of my damage as “Melee”.
This kind of heal would mean the player being healed has to stand still long enough for the effects to tale place. Maybe an in-game mechanic where by any player that stands in raid puddles for more than 5 seconds gets rooted in place until appropriately healed?
My Dracthyr Sub Rogue can now activate stealth while mounted.
Pool noodle and bin lid for a shield. 
Assassin Rogues gain the Auto Shoot ability, and all of their dagger skills can now be preformed with a Bow as well.