I quit the Straw Hats at the beginning and joined the Beasts Group

Crossing over to Pirates.
At the beginning, at the invitation of Pirate King Luffy, Ryan joined the *Cap Pirates.
But because he learned his lesson along the way and kept finishing off the low-health enemies, he got into an argument with the other members of the *Hat Pirates who were too saintly.
In a rage, he quit the *Hat Pirates.
As a half-blood of the Lunaria clan, he accidentally gained the abilities of the Bull-Bull Fruit, the Mythical Beast, and the Kirin form.
So Ryan turned around and joined the Beasts Pirates, and became the son-in-law of Kaido, the Beasts Pirates, and Yamato's fiancé.
Before the Battle of Marineford, he coldly refused Luffy's request for help.
"Sorry, I don't want to play house with you anymore!"
"From now on, please call me the Fourth Calamity of the Beasts Pirates - Blood Prison Ryan!"
"Father-in-law, you have been on the throne of the strongest creature on land, sea and air for too long. It's time to step down and let someone more capable take over!"
"I declare that from today on... the new Beasts Pirates will consist of all Mythical Beasts!"