St. Jaygarcia Saturn has had several details about himself revealed in One Piece's Egghead Arc compared to his last 20 years in the story, where nobody in the audience even knew his name. He's the eater of an Awakened ushi-oni Devil Fruit, likes sausages, might be immortal, and is just as evil and corrupt as every other Celestial Dragon seen throughout the story. He's also responsible for many issues for the people currently on Egghead; he forced Dr. Vegapunk to remove Bartholomew Kuma's free will, came to the island to personally ensure his demise, blocked the Straw Hat Pirates' escape with a fleet of Marine vessels, and killed Jewelry Bonney's mother Ginny with a disease caused by his Devil Fruit experiments. That last offense is particularly noteworthy for how it informs the character.
Source：https://www.cbr.com/one-piece-chapter-1103-st-saturn-scientist/
