Shroopers

Shroopers would replace the mooshrooms at the mushroom island (they would instead be made by putting cows on mycelium) the shroopers are a type of creeper that look like mushrooms (the bottom would be mycelium purple that fades to a white mushroom stem color, their head would be half as big becuase the other half is a mushroom and they would have mushroom pores on them)

they would come in both red and brown with a rare black one (squid head shaped) they would be friendly and when hit they would do a explosion (no greifing) that gives weakness to the player (or poison) and then run away (including surrounding shroopers)

they could be tamed with mushroom stew and they would blow up enemies and give weakness to them (they do not die after exploding)

you could grow shroopers too, by throwing gunpowder on mycelium growing mushrooms. they drop fungal gunpowder which makes shroom booms (TNT Type) it wouldnt explode anything but would give weakness.

I think adding new biome related creepers would be great for exploration because each one would give new a tnt type and it would fit with the wild update