Zephyrdor Glasya-Labolas is a member of the Glasya-Labolas Clan, one of the remaining clans of the 72 Pillars. Zephyrdor has a personality reminiscent to that of a delinquent, as evidenced through his quarrel with Seekvaira. He is also quite arrogant and has a problem with authority, as seen with him mocking Sairaorg despite the latter being on top of the 72 Pillars in terms of ranking.

(Source: High School DxD Wikia)