Skreemers

Skreemers are antagonists that appear in the fifth season of LEGO Ninjago: Masters of Spinjitzu. They are ghostly, green creatures who ally themselves with Morro and his warriors. If they attach themselves to a human's head, the human will turn into a ghost.

Skreemers like the rest of the ghost warriors also have voracious appetite, which is notably seen in the sets; they always carry some form of food or another.

The Skreemers did not make a true appearance until the two final episodes of Season 5, up to that point their head had appeared on the Soul Archer's arrows.

Ninjago.com Description
Skreemers are low-level ghosts from the Cursed Realm. Fast, but not very bright, they are pure ghostly energy. Their touch can temporarily turn someone into a ghost. They got their name from the fact that they scream loudly as they fly. Morro often flies into battle with multiple Skreemers backing him up.

Appearances

 * 70730 Chain Cycle Ambush
 * 70731 Jay Walker One
 * 70733 Blaster Bike
 * 70734 Master Wu Dragon
 * 70735 Ronin R.E.X.
 * 70736 Attack of the Morro Dragon
 * 70737 Titan Mech Battle
 * 70738 Final Flight of Destiny's Bounty
 * Ninjago Rush
 * LEGO Ninjago: Masters of Spinjitzu
 * ​"Ghost Story"
 * "Stiix and Stones"
 * "Curse World - Part I"
 * "Curse World - Part II"

Trivia

 * The Skreemers, appearance is most likely based on Slimer from the Ghostbusters franchise.