Redcap

Goblin Redcap is a demi-human from YGGDRASIL that can be summoned through either using a Horn of the Goblin General under specific conditions or a special book found in Nazarick's library Ashurbanipal.

Appearance
Goblin Redcap was described as evil and twisted looking goblins. Barring weapon difference aside, every Goblin Redcap variant seems to commonly wear a pointed red hat and steel boots.

Abilities
Goblin Redcap has the ability to hide in their summoner's shadow and possibly their target too for that matter. At the same time, they can also reemerged out of that person's shadow if ordered to and conduct their surprise attack.

Trivia

 * Goblin Redcap's primary weapon seems to vary among its summoners like Enri Emmot and Lupusregina Beta. For starters, while the ones summoned by Enri wields a long scythe, the kind summoned by Lupusregina is equipped with an axe instead.
 * Enri has thirteen of these beings as a division called Goblin Bodyguards serving under her leadership.
 * Lupusregina conjured forth thirty Goblin Redcaps that were estimated to be level 43. She also heavily hinted on the fact that these Goblin Redcaps are the lowest-leveled goblins summonable in Nazarick's library.
 * Goblin Redcap's ability seems to be exactly similar to that of the Shadow Demon's ability.