He has no friends except his cheerful housemate/couch potato, Todd (Aaron Paul) and the dog actor Mr. Peanutbutter (Paul F. Tompkins), another star of a TGIF sitcom who has managed to continue working by cheerfully taking any role, however demeaning.
Bojack: Are you punishing me for smoking, Mother?
Mother: No, I'm punishing you for existing.
There are sometimes humorous subplots. I sort of like "Vincent Adultman," who Princess Carolyn dates. No one but Bojack realizes that he's actually three young boys in an overcoat, in spite of statements like "I went to the Stock Market today and did a business."
But overall the stories are sad, about broken, incomplete people struggling with their inner demons.
But there is considerable gay content.
Bojack and Todd crash a lesbian wedding.
Bojack kisses Diane, Mr. Peanutbutter's wife, so the only way to restore their friendship is to have him kiss Mr. Peanutbutter, too.
When Bojack was on Horsin' Around, his close friend and producer, Herb Kazzazz,was fired after rumors emerged of a same-sex relationship. Bojack refused to defend his friend, and as a result Herb doesn't speak to him again for 20 years, until he is dying of cancer.
All four seasons are on Netflix. I recommend skipping the first few episodes, produced before the show found its way, and starting with Episode 8, "The Telescope."