Kururiya is member of the Tenrou Nation's highest commander group, the Ten Stars. Specifically Kururiya is the commander and leader of the Nation's Ninja Forces that deals in Espionage,Assassination and Infiltration.
Skills and Equipment
As the Commander of the Tenrou Nation's Ninja's, Kurirya is shown to have exceptional stealth, having enough skill to completely hide himself even from another fellow Ten Star Mizuchi, being directly in-front of him the entire time and was still undetected the entire time and was only noticed when he finally spoke up to him and was repeatidly shown to easily conceal himself from Mizuchi numerous times and get close to him without him noticing his presence at all
During the Bride Groom selection of the Soukai Nation, Kururiya displayed his immense skill in infiltration by penetrating the nation's defenses without anyone noticing and displayed his immense skill in acting and disguise by seemingly disguising himself as a completely normal citizen among the crowd without anyone noticing his true identity.
As one of the duties of the Ninja unit, Kururiya is shown to be exceptionally skilled in assassination. As stated by the Strange Elder that one of the favored strategy of the Tenrou nation is sending in their assassin to kill enemy commander's and leaders in the midst of invasion in order to swiftly conquer enemy nations, further hinting to his skills in assassination.