Slippy

Slippy is Lewis' Blue Slimeling pet that he got from Mars in the Minecraft series, MarsQuest. Lewis was exploring Mars, when he found a Blue Slimeling Egg. He hit it with his Pickaxe until it hatched open. They forgot about Slippy for a while until they found him again on Mars in their newest series, Hole Diggers. They forgot about him again.

Trivia

 * Some of Slippy's favorite foods are doors and flint & steels.
 * Slippy has grown slightly bigger since they forgot about him.