Hastur

Transient from the world of Old Ones who has the aliases of The Yellow King and Walking Biohazard. He's enrolled in Tokyo's great Transient research area, Ueno Academy, and he's paired with Pazuzu as his beast in the Ueno guild. He has the appearance of a bipedal lizard with tentacles. When disaster strikes, Hastur appears on the scene in a yellow biohazard suit and puts up tape to block entry. In the Enclosed Area that forms, he seals it with the Yellow Seal. Hastur is able to do this because he himself is a biohazard stronger than anyone. He has a servant race of insects that resemble ants and wasps and can desiccate living things. Hastur also has the ability to manipulate ill winds and spread poisons that can ravage the mind. He actually has an irrepressible love for humans, but it is this trait that causes him to intimidate them away from the danger he poses. If summoned by a human, Hastur would follow their orders while saying terrifying things. There's nothing to worry about as long as you aren't related to the karmic old one [REDACTED]. Hastur will only be involved in the final game when certain conditions have been met in the final game in Tokyo. He displays avoidant behavior towards that lizard lover who tries to experiment on him.

Hastur's Sacred Artifact is the tentacles growing from his body. Anything that touches their ends gets stamped with a biohazard mark called the Yellow Seal and fall under the control of his ability. The power of wind and dehydration can defend the propagation of bacteria, the insect servants can carry away hazmats, and poison can fight poison. Since Ueno Academy deals with various unknown pathogens and parasites, that is an indispensable deterrent. Without Hastur, valuable experimental subjects are liable to fall into dangerous hands and abused for bioterrorism. But if Hastur were to make a mistake, he's liable to become a security risk that would magnify even more destructive contagions. Due to that, Hastur often works separately from the other Ueno guild members at a distance. Only his tamer Pazuzu is ever with him at all times. As a Beast Tamer, Hastur is highly concerned with the guild's human guildmaster. Members of Tokyo's firefighting college and special law enforcement officers both rely and see Hastur as a danger in urban counterterrorism plans.