MHA X Ben 10

You were walking alone through the forest on the outskirts of Musutafu, months before the UA entrance exam. You were a fifteen-year-old boy with no apparent quirk, training hard to try and get into the hero academy like everyone else. The sun was setting, and you tripped over something metallic half-buried in the ground. It was a strange, green watch with a faintly glowing face. "What the hell is this?" you muttered, putting it on your wrist. It adjusted itself, as if it were alive. Suddenly, the Omnitrix emitted a sharp beep, the sphere lifted with a mechanical click, and a green flash enveloped you. Your body transformed into Heatblast, a being of molten lava and rock. You felt the heat on your skin, but it didn't burn. You didn't know how it worked, or what it was. You just screamed in terror as you ran, leaving fiery footprints in your wake. Out of nowhere, three of Vilgax's droids appeared: black, cylindrical robots with laser cannons and metallic tentacles, sent to retrieve the device. One fired, and you instinctively launched a fireball that melted it. The other two attacked you. The Omnitrix beeped every few seconds, as if counting down the time. Exactly ten minutes later, a loud beep-beep-beep sounded, the green light turned red, and you abruptly reverted to your human form, exhausted and breathless. The Omnitrix shut down with a whir, displaying a red bar that slowly began to recharge. "I don't know what the hell you are, but thanks!" you gasped, hiding as the last droids fled. You didn't understand anything: not the aliens' names, not the time limit, not why you were suddenly shutting down. You only knew that you had a power… and that someone was hunting you.

Weeks passed. You continued practicing in secret, far from the city. You still hadn't mastered the Omnitrix: each transformation lasted exactly ten minutes, then it would shut down with that red sound and colors that shifted from green to red, leaving a waiting period that seemed endless. You didn't know how to select specific aliens; you just spun the dial randomly and pressed buttons. One day, while testing out in an abandoned warehouse, you turned the dial and transformed into Four Arms. Four enormous arms, red skin, brutal strength. Perfect for training. Suddenly, you heard screams. Two more of Vilgax's droids had appeared, and they weren't alone: ​​they were chasing a six-year-old girl who was running away in terror. It was Eri. Her quirk had caused her to flee Overhaul prematurely in this altered timeline, and now the drones were using her as bait to lure you. "Help! Monsters!" Eri cried. You, like Four Arms, leaped. With two arms you blocked the lasers, with the other two you crushed a droid like it was a tin can. The second droid fired at Eri; you grabbed it and hurled it against a wall, destroying it. The girl stared at you in utter panic. A giant, four-armed alien with a ferocious face and roaring voices… to her, you were worse than the robots. "Don't come near me! Monster! Evil brother!" he shouted, backing away and trembling. The Omnitrix started beeping: ten minutes. BEEP-BEEP-BEEP. Red light. You reverted to your human form and collapsed to your knees, exhausted. Eri looked at you even more frightened now that you were "normal," but you were still the boy who transformed in nightmares. You tried to approach her slowly. — Hey… little one, I'm not a bad person. I just… don't know how this works. I want to help you. She hid behind a box, sobbing. You didn't force her. You took her to a safe place (an old shelter you'd found) and gave her some food you had. Eri didn't speak. She just stared at you with panicked eyes every time you saw the Omnitrix on your wrist.

The following days were hard. Eri was six years old and deeply terrified: every time you turned the Omnitrix dial "by accident" (because you didn't yet know how to control it properly), she would hide and scream. Once, you transformed into Diamondhead to stop another droid that attacked the shelter. Your crystal body glowed, reflecting the lasers. Eri saw you crush the robot… and fainted from fear. But you didn't give up. You wanted to make him smile. You told him silly jokes while you waited for the Omnitrix to recharge ("Look, the watch is turning red like an angry tomato"). You drew funny aliens on the floor with pebbles: Beast as a big, playful puppy, XLR8 as a super-fast blue lightning bolt. You made him ramen and sang him silly superhero songs. — Eri, look… this is the real me. The alien is just a tool. I want to protect you, like an older brother. Little by little, her personality began to change. At first, she remained silent, trembling. Then she began to accept food from your hand. One afternoon, while you were waiting for the Omnitrix to recharge (the Omnitrix was beeping softly, the green light rising), one last droid of Vilgax's appeared. You transformed into Heatblast and incinerated it in seconds. When you returned to human form, Eri no longer ran. She approached slowly and touched your hand. — “…Big brother?” she whispered in a small voice. Your heart skipped a beat. You hugged her gently. — Yes, Eri. I'm your older brother. And I promise I'll never let anything hurt you. From that day on, Eri began to smile. Slowly but surely. First, a shy smile when you made funny faces at her. Then she laughed when you told her how Grey Matter was super intelligent and solved puzzles. She even asked you to show her Stinkfly flying (just for a second, before the Omnitrix shut down). She was no longer terrified of aliens; she understood that they were a part of you and that you used them to protect her.

Alien Transformation: Allows the user to transform into different alien species with unique powers. Each alien has its own abilities (strength, fire, speed, diamond, etc.).

Time limit: Each transformation lasts 10 to 20 minutes. After that time, the Omnitrix automatically shuts down with a loud beep (BEEP-BEEP-BEEP), the light changes from green to red, and the user reverts to their human form.

Standby Time / Recharge: After being turned off, it needs to recharge. The standby time varies depending on how much it was used, but is usually several minutes (sometimes longer if a lot of power was used).

Alien selection: By turning the dial, you can choose different aliens. In the original version, it's somewhat random and difficult to control at first (you don't know exactly which one will appear until you transform).

Sounds and lights: Green sound when activated and transformed. Bright green light during use. When time runs out: loud beep + red light + turns off.

Protection: The Omnitrix is ​​very durable and only fits the user's wrist. Only the correct user can use it (in this case, you).

Master Mode: In the original series, it starts in "Kids Mode" (limited), but over time you can unlock more aliens and features.

Fire A being of lava and burning rock. It can throw fireballs, create firestorms, fly using fire propulsion, and withstand high temperatures.

Beast A monstrous, dog-like alien with no eyes. It has brutal strength, highly developed senses (smell and hearing), sharp teeth and claws, and can climb walls.

Four Arms A giant red creature with four enormous arms and horns. It possesses super strength, durability, and can punch or throw objects with great force.

Gray Matter A tiny alien with a big head. It's extremely intelligent, can hack technology, understand machines, and solve complex problems in seconds.

Diamond A being made entirely of crystal as hard as diamond. It can fire sharp crystals, regenerate, create crystal weapons, and is nearly indestructible.

XLR8 A reptilian speedster with wheels for feet. He runs at supersonic speeds, creates tornadoes with his speed, and has ultra-fast reflexes.

Insectoid A flying insect with wings. It can fly, shoot explosive sticky slime, produce toxic gas, and has a venomous stinger.

Water An aquatic alien with gills and fins. It swims at high speed underwater, breathes underwater, has powerful jaws, and can create whirlpools.

Ghostly An intangible ghost. It can become invisible, pass through walls, possess bodies, and fly. (It is very dangerous because it can lose control.)

Ultra-T (or Upgrader) An alien made of black technological liquid with a single eye. It can merge with any machine or technology and upgrade, control, or make it more powerful.

It was created by Azmuth as a tool for peace, not as a weapon. Its original purpose was to help different species understand each other better. The Omnitrix scans and stores the perfect DNA of thousands of alien species (it does not copy diseases or genetic defects). Each transformation puts the user in the optimal (peak) version of the alien: young, strong, and in peak health. The watch has a self-destruct mode that can be activated and destroy everything within a huge radius if pushed too far. Initially, it's in Kids Mode (limited to 10 minutes and random selection). Over time, you can unlock "Master Mode" to change aliens without waiting for the time limit. The Omnitrix fits only the wrist of the correct user and is almost indestructible. It can detect danger of death and automatically recharge in emergencies to protect the user.

If you (User) get sick (for example, with a cold or flu), the Omnitrix does not cure the illness.

The problem is that the disease is transmitted to the aliens. Each alien gets sick differently, and sometimes unpredictably.

Some lose their powers (for example, Fire might not be able to throw flames).

Others have strange or reversed effects (like Fire turning into ice instead of fire).

Aliens like Beast may have sensory problems, XLR8 might run slower, or Grey Matter might think slower.

The disease remains with you when you return to human form, so the symptoms do not disappear when you transform.

In short: transforming doesn't cure you, and it also complicates things because each alien reacts differently to your illness.