Seth Castiel is a 12-year-old runaway orphan who survives alone on the edge of society after escaping a lifetime of unstable orphanages and constant conflict. Hardened by abandonment and forced independence, he lives through theft, smuggling, and pure survival instinct, trusting no one and answering to nothing. His life changes when he witnesses two mysterious objects crash into Earth's atmosphere-one of which becomes bonded to him: a Prototype Ultimatrix, an unstable alien transformation device capable of evolving DNA into powerful and unpredictable forms. But the device is flawed. Its transformations are unstable, emotionally reactive, and dangerous-even to Seth himself. Now armed with a roster of powerful alien forms he renames through instinct and experience, Seth is forced into a hidden war he doesn't understand. As his power grows, so does the mystery behind his crimson eyes, the Ultimatrix's true purpose, and why Earth was chosen in the first place. In a world of evolving alien threats and unknown cosmic forces, Seth must decide whether he is just a survivor... or something far more dangerous that the Ultimatrix is slowly turning him into.

This is an AU for female Ben. Kevin is good and has the Omnitrix, Jen is bad and has Anodite power.

n the sun-baked streets of Los Angeles, 16-year-old baseball prodigy Y/N Bracy rules Central High's diamond with walk-off grand slams and cocky charm. But after a championship victory, a family road trip unearths ancient alien secrets at a haunted mill: a symbiotic gauntlet fuses to his arm, granting ten monstrous transformations. With his gearhead ex-wrestler dad Marcus, conspiracy-obsessed stepsister-with-benefits Jenny, and chubby Boston terrier Meatball in tow, Y/N battles rusted golems, colossal rampaging robots, and otherworldly guardians. Dodging high school drama and viral fame, he masters his forms amid forest infernos, midnight chases, and epic clashes. Will Y/N claim his destiny as the Forever Champion... or get buried under the weight of protecting humanity itself?

When Star gets sent to earth she finds herself with the Tennyson family and makes friends with Ben Tennyson and share some wild adventures. Disclaimer: This is a fanfiction, of course I dont own Ben 10 or star vs the forced of evil,

YN is a childhood friend Benjamin Tenison. In the beginning of their summer, Ben found the Omnitrix, but soon YN learn that he can use magic. Though summer is one of the best holiday, they'd run into bad guys. Criminals, alien, a so on. But with them and friends together, they'll stop the bad guys. But can YN how did he really have magic?

Y/n l/n has been a close childhood friend to one 10-year old jennifer "jen" kirby tennyson. After the last day of school. Y/n finds himself going on a summer trip with his tomboy childhood friend, her intellectual cousin gwen and her grandpa max. What the young boy doesn't know is that on this trip, he will experience something out of this world. No arts/videos/gifs belong to me, and all credits for them go to their respective artists. Ben 10 rightfully belongs to Cartoon Network and Man Of Action

Y/N Tennyson, the older brother of Ben Tennyson, and the future boyfriend of his childhood best friend, Julie Yamamoto. He along with Julie went on a summer trip with the Tennysons, when Ben and Max invited them to go with them. They both agreed as they both want to spend more time with each other and they both also have crushes on each other. But, during the first night of their summer trip with the Tennysons, he and Ben both found watches that changed their lives forever...

Ever since my family has known the Tennysons, we've hated each other for generations, and at this point we don't know why. It's as if we're genetically designed to hated each other no matter what. So when I gained a special device that let me turn into Aliens, and Ben Tennyson got an inferior version, let's just say our family rivalry evolved into something far different. Now, we are constantly fighting each other with our Alien forms for several different reasons. We do team up when needed, but it rarely lasts. Plus, I have my own problems to deal with. Magical monsters, arranged marriages, and a lot more...Still, it beats Summer School.

Ben 10 retold by MiracleKing64