[quote=@Reflection]
[@Sosuke] Alright, but be aware, that depending on his strength, we may request that he be treated as a superior servant, and as such you'd only be able to pair with a Master who picked the Superior servant buff. 
[/quote]

He's merely the king, not the demon that people believed him as. He's not Aži Dahāka in this form, maybe as Berserker.