Otto Hauptmann is renowned throughout the Lualdi Pokémon League as a ruthless businessman in all his dealings. He has an undisputed sense of command and doesn't tolerate anything being out of place. Even prior to becoming Gym Leader, he was one of the wealthiest individuals in Lualdi and still owns stocks in most prosperous Lualdian businesses. An investment or even just an endorsement from Otto is a sure sign of success; urban legend states that A.U.T.O. Corporation actually named itself for Otto Hauptmann as one of their primary benefactors.
It is known that Otto actually dyes his hair grey to make himself appear older; for similar reasons, he always walks around with a cane and never dresses down, no matter how casual the occasion might be.