301 Votes in Poll
Nah i think they are canon cause the land of Aaa is exactly the opposite gender not the way they act. As you can see in the episodes when they show Fionna and Cake, everyone is the same but just the opposite gender. If it was different then for example Jake and Lady are together in Ooo but in Aaa Cake and Nightocorn are still together, if it was different like Admo said then that means Cake and Nightocorn would hate eachother. So Marshall Lee and Gumball are canon.
Good point, but I think when Ice King writes his books he incorporates the real world of Ooo and also what he thinks is happening. Because he doesn't know everything that's going on, for example I don't think he knew that Princess Bubblegum didn't actually love Finn cause in the first Fionna and Cake episode Prince Gumball liked Fionna. So that means what he thinks and wants to happen like him being a hero is what he writes but with most of it being reality. But I think around the end of the series I think Ice King kinda found out that Bonnie and Marcy had some love connection cause in "Broke His Crown" they were holding hands a lot. So maybe he suspected it we don't actually know😕. But if he did suspected it than I think he would probably add it in his fan-fiction, cause I would if I found out😂. But than again it's just a theory.......A CARTOON THEORY!!!!!!