ディートリヒ・ケステン

A butler who has served Arnold since his childhood. Dietrich is absolutely loyalty to the Leroy family because he feels indebted to Arnold's father for taking him in when he had nothing. Dietrich is calm and doesn't show much expressions, but when it comes to Arnold, he has a very overprotective and worried side. He is very displeased by the paparazzi who sometimes chase Arnold.

[Translated from Wikipedia.]