Pink creepers have a much larger blast radius than normal creepers, They also spawn obsidian blocks in a circle around them in a circle when they detonate, making them a good way to obsidian farm. They can only spawn in places like dungeons, strongholds, and abandoned mine shafts, where mob spawners occur. The mob spawners that spawn them only spawn on hard mode. Pink creepers also hate bright lights, and will burn much more quickly than zombies or skeletons, preventing them from spawning when torches or lava are placed close to the spawner, even the spawner will burn!
This mob is bright pink, they have many shapes, and are meant to stand out in dark caves to scare the player, they are larger than creepers.