At a young age y/n l/n was found by the whiteboard pirates.

the pirates speculated he was a type of fishman based on his ability to swim under water and have uncontrollable power.

after ten year of staying with them he leaves them making them sad but he said that in their most hopeless moment he will come aid them. that was the day ace joined the crew.

and after 8-9 years the war at marine ford started and just as everyone thought ace would be killed he emerged from the depths and saved him.

and he was given the title of titan of the sea Kyogre