Rahab

Rahab is a monster in the Hebraic scriptures and the Old Testament of the Christian Bible.

Rahab is envisaged as a sea serpent of enormous length and great power, the serpent or dragon of primeval chaos. And Chaos is what he's good at, he will cause it mischeviously and randomly to anybody. He is not to be played with and is not for the beginner companion. He needs a firm hand and an even firmer house rule. 

In medieval , Rahab (noise, tumult, arrogance) is a  sea monster, a dragon of the waters, the "demonic angel of the sea". Rahab is also seen as a deity in the text. Rahab represents the primordial abyss, the water-dragon of darkness and chaos, comparable to Leviathan and Tiamat.

Rahab later became a particular demon, inhabitant of the sea, especially associated with the Red Sea. 

There is his background, let me tell you it is firmly earned. He has a bad temper and is arrogant and rude.