Olson is the kind gent who you come across out side Garland's shop along with Marina. He tends to fade in the background a lot of the time. He is one of the few characters Professor Layton does not offer tea to.
Olson wears a red jacket, yellow top, blue trousers and glasses.
Olson gives the following puzzles in Professor Layton and the Diabolical Box:
"Olson doesn't draw much attention from people, and he isn't much for cracking a joke. His eyesight is so bad that, even with his glasses on, the illusion of Folsense could melt away and Olson wouldn't notice any difference."