How is Pedro related to Ninjas at all.
This is worse than the Yamato role is a Samurai
No it is not. Yamato is now one of Momo's retainers which makes Yamato at least a Samurai at heart. hehehe
If a list of animals that have ninja qualities were made, a feline would be on that list, maybe even on top!
Pedro was hiding in the treetops when he first talked to Luffy. This is after Luffy had shown excitement to a Ninja. Ninjas hide... a lot.
Luffy with CoO could not tell where Pedro and the other Guardians were when they surrounded Luffy when he was fighting Blackback and Roddy. Ninjas are good hiders as they want to get the drop on the enemy and not the other way around.
The Minks exclaimed Nin-Nin when Raizo was freed from chains showing a Mink fondness to Ninjas. Next scene shows Pedro standing high on a tree branch. Ninjas are known for surveillance which includes spots with higher elevation. In fact, Pedro shows he has a propensity to be in higher elevation then other characters (Pekoms room when Pekoms is recovering, Crows nest on Sunny, In cart in Mirror World, etc...)
It has been established that Oda likes to use wordplay in One Piece. Below is my example of possible wordplay that connects Pedro with Ninjas.
Portmanteau: a word that combines the form and meaning of two or more other words; a blend.
Words to combine:
Ninja -> Sneaky, Ambushes Enemies
Jaguar -> Jaguar Mink
Guardian -> Captain of the Guardians
Put them together... Ninjaguardian!