It's based off the "Meet Baroque Works" chapter cover series where Miss Goldenweek uses her paint to turn everyone into their dream forms. She becomes an artist, Miss Valentine becomes a baker, Ms. Merry Christmas turns into a princess, Sir Crocodile becomes King of the Pirates, Mr. 4 turns into a Pizza Deliveryman, Mr. 1 turns into a superhero, and Mrs. Doublefinger reverts to her Paula identity.
I can't quite remember what Lassiu, Mr. 3 and Mr. 5 become. Mr 2 evidently stays as-is.