Lieutenant Kotler is an arrogant Nazi guard with aspirations of greatness. He relishes any opportunity to abuse and demean the prisoners who work in Bruno's house; not only does he seem to truly believe that he is superior to them but he also seems to enjoy showing off for Gretel.'
Killed innocent people
He his a very stubborn character and acts good around Bruno's father but horrible to Jews.
Fools around with Bruno's mother, '"Don't worry, this one knows which side his bread is buttered on," and laughing in a nasty way.' pg.163
He is mean to Bruno somtimes but kind to him when he wants to.