Cleos

Cleos is a beautiful young man who acts as Danblf's surrogate and is the Surrogate Wiseman of the Tower of Summoning. He continues to swear loyalty to Danblf, and recognizes the high ability of his disciple Mira. He is also a talented summoner and a teacher at Arkite Academy.

(Sources: She Professed Herself Pupil of the Wise Man Wiki and Official website).