Немного о себе
Lest has an intelligent nature. His child-like appearance is contrasted with his capacity for analysis.
He holds traits that make him seem like a good fit for his current rank. His arrogance is shown by the fact that he is quite against Krul's decision-making within her power as the Queen of Japan. He even went as far to state that he himself was perfectly capable of ruling Japan as the King.
Despite his disagreements with Krul, it seems he is actually most likely capable of holding all of Europe, as we've not heard of any conflict from that side.
He does seem to show a rather childish side when he questions Geales about his activities and how he rules Russia. However, he can also display his serious and superior attitude when the situation calls for it, as shown when Gabel Parthe continuously goads at Ferid for being a mere seventh progenitor when Lest tells him to be silent.