Excellent, I must check social media to see what my acquaintance's son is.
First time I heard of world book day, it was because she'd dressed him up like Buzz Lightyear (from the Toy Story novels). The following year, he was Woody from the same novels.
(The Porcupine From Purgatory katsu revival trust, Thu 6 Mar 2025, 9:25, archived)