He’s well mannered,realistic,apathetic,and kind.He only uses his magic if necessary and prefers a hands off approach when it comes to teaching others such as Letty’s “training arcs” mentioned several times in the series.Earlier in his life,he was often driven by an thirst for knowledge,and he might live this passion via travelling with clinets and learning about them and their preferences.He isn't completely emotionless,he just hides them well unless he is happy then he will give a polite smile.