While I know various editions of The Wind in the Willows and Aesops Fables along with Brambley Hedge, the Narnia books, Coyote Goes Walking, and Crow and Weasel are all on my mental and physical bookshelves
The answer is that it's a creature type that has a lot of backward compatibility
From special foil cards to booster packs and more, there's a different Pokemon goodie to open every day
4 Nani, Protective Sister Strong Inside and Out Although not similar in numbers, the reasons Nani is a strong option are the same reasons that Joshua Sweet is
Even though it starts as a 1/1, it quickly grows as more creatures enter the battlefield (which synergizes incredibly well with Cats like Arahbo, Caracal, and Prideful Parent that add multiple bodies to the battlefield), eventually ending up a massive flier