I_liek_rainbowsss
I doubt they will ever call him celestial smth, that's too close to their own name. As for his nickname, it could be smth about his appearance, powers or actions. Maybe one of the underworld emperors because in the end that’s what he might be from the description. Maybe Black Hole Kairo, or smth like a codename like Underworld Emperor Pain, since few people know who is leading the organization. As for the information agency, maybe smth like web, Arachne or smth like that because of their network. Thanks for the chapter. And I can understand your pain at naming things. :D
Some Ideas for the powers of The Zushi Zushi no mi: Heavy Infighting: The user moves in close to their opponent and rapidly punches them. The user augments gravity in a way that it simultaneously increases the weight of their fists, making the punches deal more damage while decreasing the weight of it, making the punches faster. Black Coffin/Kurohitsugi: Traps the target in a black hole, overtaking them with a powerful pull of gravity, sealing them up like a corpse in a coffin (it's the Hadō 90)