Samovan (サモヴァン)

サモヴァン国王陛下
King Samovan

samozvanets = Pretenders in Russian
Demon’s name should be Ashmedai

https://en.m.wikipedia.org/wiki/Asmodeus

Rewrite:

Hello! I really love Samovan design! I would have him as a villan boss character in this story. The story is about a person who was Isekai’d into a fantasy world that is a mix of the MMORPG they were playing + an old Europe type world (so Overlord or any other generic isekai anime I know). Shaym would be a king for an opposing country, who is behind a lot of the cruel treatment of demi-humans and the war. It turns out that King Shaym was devoured long ago by the demon (who’s mouth we see on the stomache). The demon was feeding on the negative emotions and souls of the victims of the war. The demon is defeated by my main character and the war is ended. So Shaym’s death will mark the start of the demi-human and human interaction change arc.