The seas trembled. The very air itself seemed to recoil in his presence. Fleet Admiral Sakazuki—Akainu—stood alone at the summit. The world held its breath.

The Gorosei knew fear in the depths of Maryjois, the Five Elders exchanged uneasy glances. Even Imu, the shadow sovereign of the world, clenched their throne in rare unease. The Yonko? Not ready. Shanks sat at the prow of the Red Force, his usual calm shattered by a rare frown. "We don’t want that fight," Shanks said simply. Blackbeard laughed nervously, his usual bravado gone. "Even with two Devil Fruits… nah, nah, I ain’t stupid..."—Kaido, the so-called "Strongest Creature" drank heavily just to forget the memory of HIM. Big Mom? She never mentioned his name. The Warlords? Forget it. Doflamingo, for once, had nothing smug to say. Mihawk, the World’s Strongest Swordsman, merely sheathed Yoru and ran away. The Supernovas? Law teleported to the other side of the planet the second he sensed Akainu’s presence. Kid, for all his bluster, ran.

The Straw Hats? Oh Hell No. Luffy trembled even in Gear Fifth. Zoro curled into a fetal positon. Sanji’s cigarette fell from his lips. "We… we’re not ready." Jinbei admitted. "We'll never be." Nami corrected, already mapping an escape route.
Goku, mid-training on Beerus’ planet, suddenly paused. "Uh… yeah, no. I’m good. I don't think even Lord Beerus would want that fight."
Aizen and Yhwach both felt shivers run down their spines at the mention of his name. "Not even the Almighty would work..."
Sonic the Hedgehog? He got so fast specifically 'to' run away from HIM.
Superman, in the Watchtower, turned pale. "We’d lose. All of us. In minutes."
Simon the Digger, the man who pierced the heavens, took one look at Akainu and backed down. "I know better than messing with him."

Conclusion: He is HIM.

Nobody was ready for HIM.