I made a suggestion that I think Is similar's to ryanvia, and I even made a thread on it.
Something like orc devourer or flesh-eater. You know stacker classes? This is one of them. It starts out weak, but the more kills it gets the stronger. I think this would be really fun, and here it is;
Cost: 20,000
Abilities: Every kill this class gets with ghast tear renamed "Teeth", rises a tier. Has a multiplier on hunger loss each kill.
Armor:
Tier 1- All leather
Tier 2- Chain Chestplate, all leather
Tier 3- Chain leggings, all leather
Tier 4- Chain Boots, now all chain
Tier 5- Iron Chestplate, all chain
Tier 6- Iron Leggings, all chain
Tier 7- All Iron
Tier 8- Protection I On chestplate
Tier 9- Protection II On chestplate
Tier 10- Protection I on leggings
Tier 11- Proj. Prot I On Chestplate
Weapon:
Teeth-
Tier 1- Sharpness I
Tier 2- Sharpness II
Tier 3- Sharpness III
Tier 4- Sharpness IV
Tier 5- Sharpness IV+Poison
Melee-
Tier 1- Wooden sword
Tier 2- Stone Sword
Tier 3- Stone Sword Sharp I
Tier 4- Iron Sword
Tier 5- Iron sword
Tier 6- Iron sword sharpness I
Tier 7- Mace (Iron Shovel) Sharpness VI
Tier 8- Mace (Iron Shovel) Sharpness VI+KB I
Effects:
Tier 1- none
Tier 2- none
Tier 3-none
Tier 4- Strength
Tier 5- Increased hunger
Tier 6- Nothing
Tier 7- Strength II
I know this Class would be INSANELY hard to code, but maybe something along the lines of it, it would be EXTREMELY fun.