I'd say hoping for a Joy Boy crew member is wishful thinking. If true, it would mean Biblo was born in the Void Century over 800 years ago.
Let me think 🤔
Narratively, I haven't given Biblo much thought. He is definitely interesting, but is there any clues about his origins?
1. He reacted to the fire by taking all the books to a secret room.
- This indicates either complex thinking processes or an obsession with books.
2. Biblo is believed to be a Devil Fruit user.
- Lilith suspected he ate the Growth-Growth fruit making him a Growth Owl.
The contradiction: An owl does not possess complex thinking processes. By its own nature, forming plans that way is not within reasonable boundaries. Additionally, if the logic Lilith used holds true, then it is not a person at all. It's an owl.
The solution: It is not the Growth-Growth fruit, but a Zoan type Devil Fruit that allows a person to become an owl with the ability to change the size of objects.
Conclusion: if what Lilith says is true, then it is not possible for Biblo to be an actual person because the type of fruit is a Paramecia. However, it is strange that an owl is using complex thought patterns, so it's possible that it isn't a Paramecia fruit at all. I prefer to err on the side of caution, though. It is just a complex owl. Conversely, if it isn't an owl, it requires a very specific form of reasoning that relies on a hypothetical Devil Fruit that has an as of yet unknown mythic origin.
Other contradictions:
1. If Louis Arnot is a human, then the lifespan doesn't make sense.
2. Animals don't gain human-like intelligence unless they consume a human Zoan fruit.
- However, animals with a high level of life force actually have voices. For example, Zunisha can speak (telepathically) using sophisticated language and it has never been confirmed it has a Devil Fruit either.
3. Biblo is so old its origins are mysterious even to giants with long lifespans.