Geelan

Geelan (ギーラン) is an antagonist of The Promised Neverland series. He is the lord who runs the Geelan Clan and a demon who was betrayed and enslared by the royal family and its five regent houses, all because of a crime they did not commit.

Ever since then, Geelan harbors great hatred towards the royal family and desired to get his revenge on them, which he later did during his clan and "William Minerva"'s surprise attack during the Tifari held at the Imperial City, where the royal family and the members of the regent houses are.

Appearance
Geelan possesses a hideous insect-like appearance along with an imposing figure, towering over Norman. He appears to be adorned with several garments.

Norman
Norman, who took up the name of the deceased William Minerva, formed a temporary alliance with Geelan and his clan. Both of them display antagonism towards the royal demon family and the five regent houses, and thus they are on neutral terms with each other and view each other as allies for the current time being. Norman promises to aid Geelan in getting revenge on the royal family and the houses in exchange for freeing the orphans in the farms the demons own. Though the two agreed on the said terms, both sides are skeptical of trusting each other and both planned on backstabbing the other once their side of the promise is fulfilled.

Geelan heavily suspects Norman's intentions, and do not believe him to be the actual William Minerva due to the news of how the latter has died. Geelan theorized Norman to be one of the escaped premium quality child from Grace Field House due to his young, physical outlook. From which it sparked his intentions of consuming him, as shown when he licked Norman's bloody fingerprint which was inked on his contract with him.

Legravalima
Geelan loathes the royal demon family due to how they had betrayed him and his kind. It was not shown whether Geelan hated Legravalima in particular, but most likely should since she is part of the royal family.