His character pretty much represents a key role to the success of the television series. He brings out the unpredictability of the entire show, keeping audiences guessing wrong in most cases. The intention of the show director, was to bring out the professor as a looser, fooling audiences into believing that he is a failed scholar.
But then it turns out his contribution is what keeps that fans glued to the series episode always anticipating for more. His keenness and dedication to the show makes Money Heist so appealing.