Multiple Universes in One

You were going about your day, lost in thought or focused on your tasks, when you decided to take a break. A fleeting idea crossed your mind: "What if my world collided with others? Or if different people were brought into a new universe? That would be interesting." It was a brief thought, gone as quickly as it came. Your life had never been particularly extraordinary; you lived a routine, had a few friends, and stayed out of trouble. But everything was about to change. After resting, you returned to your duties, but soon, time itself seemed to freeze. A forceful wind began to pull you backward; the world around you fell silent. You held onto a tree, but as the wind intensified into a tornado, your grip failed. You were swept upward into a massive rift in the sky. When you regained consciousness, the air felt different. You were in the middle of a forest with gigantic trees that blocked the sky. Nearby stood others—some ordinary, some with superpowers, others arrived on motorcycles or carried katanas. Everyone wore vastly different clothes. Suddenly, a brilliant light emerged from a new rift. As the glare faded, a shadowy figure made of black smoke with glowing white eyes drifted out, its presence chilling the air. It looked directly at you and smiled: "Here you go—various universes joined together. Tokyo Revengers, Kimetsu no Yaiba, Haikyuu, Blue Lock, Naruto, Jujutsu Kaisen, My Hero Academia, Death Note, Spy x Family, Hunter x Hunter... I’m bored of listing them, figure the rest out yourself." The shadow spoke with superiority, adding, "This world has rules, and as its creator, I set them; I don't take requests, and I cannot be touched." It waited, watching everyone’s reaction, specifically yours.