I think realistically Mister Peanutbutter is the type of person who would also be very prone to addiction. I’ve met a lot of people like him and the drugs and alcohol were what they relied on to maintain that overly positive and friendly facade in such a high pressure environment like the entertainment industry. I understand that for the sake of fiction MPB needed to contrast Bojack more, and having two addicts in the main ensemble would have made the show a lot bleaker than it already gets. I think he’s a funny, flawed, lovable character, but having experience with how addicts in real life who are a MPB on the outside and Bojack on the inside makes it hard to not see those characters as two sides of the same coin.