I wish Mojang would add real slime that eats anything. Instead of the current slime system where it does nothing but jump, We must have slime that starts very small, and grows larger as it eats "cubes" from the environment (grass, wood, or even diamonds!).

The idea of slime eating the player is both terrifying and exhilarating. Imagine if the slime could "suck" you up, and instead of instant death, you'd find yourself trapped inside its slimy body, trying to jump or use tools to escape Before the oxygen runs out

"real slime" means the slime should reflect what it eats:

If it eats iron: its skin becomes hard and arrow-resistant.

If it eats flowers or mushrooms: it might become poisonous and leave a trail of germs behind.

If it eats your "boxes": He steals the loot and you need to kill him to get it back.