What Impression does Lieutenant Kotler give Bruno

Bruno goes upstairs to help Maria unpack in his new bedroom, which he finds quite depressing. He asks the maid what she thinks of the situation, but she responds that she has nothing to say about it. Bruno starts complaining about Father's job but stops abruptly when a figure appears by his door. It is Lieutenant Kotler, a young man who will be working under Father. Bruno has a bad feeling about him. Kotler calls Bruno “little man” and makes Mother laugh.