Doug is an adult human male with dark brown hair that is above shoulder length with long bangs framing his face. He has a mustache, goatee, and beard.
He is seen wearing a button-down white collared shirt, unbuttoned black sports jacket, black dress pants, brown belt, and black dress shoes.
Doug appears to feel guilty for his previous lying, cheating, and stealing as indicated by the story he tells during group therapy. Little else is known about him.
In The New Client, Mr. Peanutbutter shows up at Pastiches, on the visiting day. He then runs into BoJack, who says this can not be happening. Doctor Champ shows up and asks if Mr. Peanutbutter is here for the visit day meeting. Doctor Champ says Mr. Peanutbutter is the first friend BoJack has invited.
Mr. Peanutbutter says he wasn't even aware he was invited. BoJack tries to say, he did not invite Mr. Peanutbutter but is interrupted by Doctor Champ introducing himself to Mr. Peanutbutter. He then says he's proud of BoJack for inviting someone. They bond over the fact that they are named Mr. and Doctor. BoJack then asks if Doctor is just his name, and is he not a doctor.
Doctor Champ then gives everyone a five minute warning time to gather. Mr. Peanutbutter then tells BoJack they should find good seats. BoJack points out they are sitting in a circle, and therefore they are all good seats. While sitting in a circle listening to Doug tell a story about lying, cheating, and stealing, Mr. Peanutbutter asks if Doug ever told his wife about the cheating. When Doctor Champ tells Mr. Peanutbutter that they don’t interrupt others while sharing, Mr. Peanutbutter tells Doctor Champ that he was just looking for a little context, and BoJack sarcastically tells Mr. Peanutbutter to look for the context in his car.
Mr. Peanutbutter tells Doug that in order to move forward with his wife he needs to be honest with her. Although Doug agrees with him, Mr. Peanutbutter backtracks saying that confessing to cheating might just be his guilt talking, and maybe it would be better if he “let sleeping dogs lie." Mr. Peanutbutter proposes a scenario in which Doug’s fiancee, whom he calls “Pickles," doesn’t know that he cheated and she’s happy not knowing, asking if confessing would just cause additional pain, to which the other people in the room agree with him.
When Doug asks if it’s better not to tell his wife about him cheating on her, Mr. Peanutbutter gets mad and tells Doug that not telling her would be really convenient for him, going on to call him stupid, selfish, and inconsiderate. Although it makes Doug cry, Doug admits that he needed to hear it and gives Mr. Peanutbutter a hug and then thanks him.
BoJack then goes and finds Mr. Peanutbutter, and tells him he doesn't know what's going on with him, though it is implied he knows Mr. Peanutbutter cheated on Pickles from listening to him in the group session. BoJack says he understands what it's like to have guilt bottled up inside you, and not burden other people with it. He goes on to say you think you are protecting them, but it comes out in other ways, and it infects everything. Mr. Peanutbutter says he needs a drink and asks if there is a bar. BoJack then reminds Mr. Peanutbutter that he was in a rehab facility, and Mr. Peanutbutter subsequently leaves.
- His last name is never revealed.