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The Barman is a dapper individual, who traverses the Progressiverooms, generally unbeknownst to any researchers. He is very dapper. The Barman is the only person who has been able to withstand the presence of Upsilon. They are besties.
If you're ever distressed or in need of help The Barman will make himself known to you and say "Why the long Face?" If you need it, he will wax poetically about great philosophical minds, such as Schopenhauer, Nietzsche, or Dostoevsky. His presence is generally benevolent, trying to cure your ailment with tidbits of advice, and humorous tales.
The Barman physiologically is a Dapperly dressed Man with a bunny for a head.