Mist Creeper

Note that this does not exist in Minecraft; it was written purely as a fiction article.

Mist Creepers are a rare hybrid that have only been seen in abandoned mineshafts. They were born from a Ghost Creeper and a Shadow Creeper. They can appear and vanish like Ghost Creepers, but retain the stealth and sneakyness from Shadow Creepers.

Tactics
You can tell where a Mist Creeper is by looking for pale clouds of fog. When seen in their true form, they emit lots of fog, then vanish. Their other form is their Mist Form, which looks like a cloud of fog. They are used to sneaking up on miners, then scare them with a hiss. They do not actually fight miners, but like to get their reactions from startling them. They can be annoying for scaring miners in thinking there is a creeper behind them.

Disadvantages
When forced to go aboveground or near light, they become solid.