'With Bubble Puppy and Gil the Guppy...'
This is what happens when I like two shows and decide to combine the two of them.
Gil and BP as Finn and Jake - Gil's the silly but well-intended hero. BP is his dog, so...
Molly as Princess Bubblegum - A pink-haired princess who's the 'love interest' to the hero (though less obvious in BG)
Deema as Marceline/LSP - Really the only one who could pull off the trickster and drama queen at once
Goby as Flame Princess - Honestly, the choice was because Goby needed to be someone, even if said someone was female
Oona as BMO - The cutest character in the entire show. Seriously, look at her
Nonny as Ice King - The most odd choice. I don't know... both aren't good with people? I think it's more 'Nonny as Simon who was turned into the Ice Prince)
You may be able to tell I digitally edited Oona to be smaller than I originally drew her. She is BMO after all - she must be small and cute.