A cute little creeper that follows you whenever you go! You can tame it with gunpowder, and he might sometimes give you some surprises!
It has a really low chance of spawning, but it spawn anywhere at any time.
V2: Added 3 new mini creepers with different abilities!
V3: Added sitting! If you right click your pets, they will stay still! This is showed with particles that spawn when you right click it!
Added a 1.14.4 downgrade! 
Do you want to know what they do in advance? It's a spoiler, but ok...
Green: Gives Iron!
Blue: Gives diamonds! (really rarely)
Yellow: Gives haste 2 for 60 seconds! (Rarely)
Pink: Gives healt regen 2 for 60 seconds! (rarely)