Dagon (Ben 10)

Dagon, also known as Diagon, is a Lovecraftian-esque demonic entity from another dimension, an interdimensional conqueror which has conquered a 100 dimensions. Its true colossal form resembles that of an octopus. The face consists of two eyes framed by hooked projections and a mass of large tentacles. From the back is a gigantic tentacle and most of its body is covered by brown armor. One of its form is that of a giant serpentine octopus with a gigantic tentacle coming out of its back like a tail and brownish armor covering most of its body. Another form in which it manifests is that of a huge dragon, complete with claws and wings.

As it is a being whose substance consisting of power, it sees itself as a god. One whom has the right to rule all other lifeforms. Making him not only power hungry but arrogant, talking down to others and seeing most as nuisances at best. He does possess some honor, but only when dealing with the strong and likewise respects those with power. With a heart that possesses the power to reshape a universe, he is a nigh-omniponent being. Among his powers are super strength, levitation, shapeshifting, weather control, breathing fire, optical laser beams, regeneration, teleportation, power bestowal, and transforming others. It can dominate others via mind control, resurrect the dead, and is knowledgeable when it comes to magic. Serving it are the Lucubra and for a time, the galactic warlord Vilgax served him. Being a supernatural entity it is bound by the rules of magic.

Trivia

 * Despite its name being taken from that of Dagon it is clearly more closely based on Cthulhu.