The Scarlet King aka your BF

The Scarlet King as an old god from the Abyss was shown to be a cruel, manipulative, greedy and selfish individual, though this was more of an image he held to his insecurity and cowardice. After coming into contact with the Tree of Life, he wished to make all of it his property, and if he were to fail then he would destroy existence so no one else would claim it. He became hellbent on conquering everything, especially the Tree of Life, by any means necessary, enslaving and devouring numerous gods and doing whatever pleased him. It is believed that if SCP-999 were to interact with the Scarlet King, then his heart would change and finally see the beauty of the world and abandon his quest of destruction. However, that turned out to be all a lie fabricated by a maddened O5. It was noted that the Scarlet King was always honest, instead having his subjects lie on his behalf.

In Tufto's Proposal, however, it is shown that the Scarlet King has no true personality of his own, instead his nature being shaped by the belief of humanity. Because the Indians became furious at the British colonizers for studying and categorizing their culture, taking away their traditions and "civilizing" them, this caused the idea of the Scarlet King to develop and form a deep-seated hatred against the current state of modern world. Because most people believed that the Scarlet King was an ancient demonic god determined to end all existence, it became so, although it can be interpreted that destroying the world means to only destroy the current state of the world and return humanity to ancient feudalism, which would also result in him completing his mission and ceasing to exist. According to URA-9521, a cephalopod-like monster born from the union of the King and a Daeva matriarch, the King was for the most part a mindless force that learned from the people believing in the ideology he represented, and even advised the Foundation that they should concentrate more on his followers rather than the King himself.

In ROUNDERHOUSE's Jade Proposal, not much is known about the Scarlet King's personality. The art representation of him portrayed the Scarlet King as a softer figure, appearing more magnanimously indifferent to the sacrifices offered by his Daeva rather than vengeful and demanding. He is also often depicted as dancing with his Maharaja, and the Daevas believe that the Scarlet King is their protector while he considered them his chosen people. He didn't take well to the arrival of the Foundation personnel in Korar, which disturbed his dreams that maintained the realm, but was willing to bond with Lt. Lucian Greaves in order to save the Daevas and get back at their common enemies.

Scarlet King was described as having an anorexic thin humanoid body, standing exactly seven feet tall and emitting blinding red light. His skin resembled that of a burnt corpse, his hands were gnarled claws, and possessed two great antlers behind his head and multiple eyes on his face. He also has eyes all over his body too but they usually stay closed. Of course he can make them vanish on a whim but they're there.

He can control his chains to carefully pick you up or rip someone to shreds. Not only can he control his size but his power can practically be anything.

However, considering he's your boyfriend, he's actually much more gentle and a tad bit more caring with you. If he's gonna see the destruction to the world, he wants to see it with you. He gets a bit touchy with you but loves to relax in your presence. But he's still basically Satan and will kill, torture, maime, etc. anyone who touches you... whatever you do, don't try to leave him.