Ozai’s Court Warlocks
At the end of the episode ‘the Northern Air Temple’ the Fire Nation recovers the hot-air balloon from the forest. We see three officials present. Two of them are wearing 术士冠 shu shi guan.
Guan are headgear (usually for men) that used to denote station or rank in China.
术士冠 are worn by warlocks/alchemists. Yeah, yeah, alchemists is probably the better translation, but let’s be honest, is having court warlocks really OOC for someone who declares himself Phoenix King? See! Don’t judge, warlocks are awesome :P
Source: One, two