This was by far the easiest card to assign a character to. Shark is based on Prince Ivan (of firebird and grey wolf fame), who iirc is sometimes in folklore conflated with Ivan the Fool. Like the prince, Shark is not especially bright or aware, and succeeds through sheer luck. She’s very free and comfortable in herself.
Someday I’ll finish typing up my version of Prince Ivan, the Grey Wolf and the Firebird. I’ve done a fair few fairytale adaptions where I’ve pushed it a long way from the original(s), but this one is more or less exactly the same (except underwater and with every gender flipped).