Mitch is the manic owner of the Last Plank bar in Far Harbor. Mitch appears to be happy and optimistic when interacted with. Behind the bar counter, there is a letter, RUN!. Reading it states that Mitch believes the island is cursed, and wants everyone to get off the island.
When the Sole Survivor enters the bar, Mitch will be trying to get everyone's attention. He will then announce the next round of drinks are on the house. When the Sole Survivor first talks to Mitch, they can ask him for something stronger than beer. If a speech check is passed, he will give the Sole Survivor a bottle of vodka, which he says is top shelf stuff.