Ben 10 Crossovers
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Ultimate Kaisen by Shinobi360 reviews
He was supposed to be dead. After sacrificing himself to save the Ultimates, Ben finds himself not in the afterlife, but in a world far different from his own. Stranded with no way to return back home,Ben must adjust to his new life. However,it seems that wherever he goes, his responsibilities as a hero still remains the same. Only instead of fighting Aliens,he now faces Spirits.
Crossover - Ben 10 & Jujutsu Kaisen/呪術廻戦 - Rated: T - English - Supernatural/Adventure - Chapters: 15 - Words: 102,446 - Reviews: 138 - Favs: 168 - Follows: 185 - Updated: 5/24 - Published: 1/7 - [Ben T., Kugisaki N.] Itadori Y., Megumi F.
Harrison Tennyson by spitfyre1 reviews
After Vernon went too far one day Harry found himself a new family, meet Harrison Tennyson, hero, plumber. How will he handle his new responsibilities as a world he left behind wants him back eventually Pairing HP/GT/KE and potentially more.(FEM! Kevin)
Crossover - Harry Potter & Ben 10 - Rated: T - English - Romance/Adventure - Chapters: 4 - Words: 9,358 - Reviews: 22 - Favs: 185 - Follows: 208 - Updated: 5/23 - Published: 11/9/2021 - [Harry P., Gwen T., Kevin]
10 Deadly sins: Volume 1 by Squidsquito reviews
Ben somehow ended up in the Seven Deadly sins world. Its Ben job to help the Seven Deadly sins and defeat the holy knights that is corrupting the kingdom. Ben will have to face fierce and dangerous opponents, will heroics save everyone and what is he feeling towards the giant beauty. Join Ben and the Seven Deadly Sins on a journey through the land of Britannia. [Ben x Diane]
Crossover - Ben 10 & Seven Deadly Sins/七つの大罪 - Rated: K+ - English - Fantasy/Romance - Chapters: 10 - Words: 86,972 - Reviews: 116 - Favs: 132 - Follows: 144 - Updated: 5/22 - Published: 12/1/2020 - Ben T., Diane
Multi-Love by Squidsquito reviews
Ben universe is destroyed and everyone he knew is gone. He wakes up in a new created universe with a new home and friends. The hero now travels the Multiverse to save the universes from Multiverse threats and try to find a way to repopulate humanity in his universe, but Ben will also find some interesting characters.
Crossover - X-overs & Ben 10 - Rated: M - English - Romance/Adventure - Chapters: 8 - Words: 39,105 - Reviews: 71 - Favs: 62 - Follows: 70 - Updated: 5/22 - Published: 2/8/2021
Fairy King by Zer0erZ reviews
Ben Tennyson had always thought that he could handle anything the universe could throw at him, he didn't expect to be thrown out of it. In a strange new world, he goes on a journey to get back home, all the while making new friends and doing what he does best. It's Hero Time!
Crossover - Fairy Tail & Ben 10 - Rated: T - English - Friendship - Chapters: 4 - Words: 12,528 - Reviews: 18 - Favs: 36 - Follows: 42 - Updated: 5/21 - Published: 9/3/2020
Marco 10 vs the forces of evil by CHAOSCONTROLFREAK455 reviews
This is basically Star vs the forces of evil exept Marco is the main character and has the Omnitrix and he also has a harem but completely oblivious to it like classic harem animes
Crossover - Star Vs. The Forces of Evil & Ben 10 - Rated: T - English - Romance/Adventure - Chapters: 17 - Words: 31,369 - Reviews: 58 - Favs: 81 - Follows: 80 - Updated: 5/20 - Published: 1/7/2021 - Marco D., Star B., Janna, Azmuth
Harry Tennyson! by The Dark Dragen reviews
DEAD AND UP FOR ADOPTION, MIGHT REDO ONE DAY BUT HIGHLY DOUBT IT!
Crossover - Harry Potter & Ben 10 - Rated: M - English - Chapters: 20 - Words: 53,446 - Reviews: 516 - Favs: 1,324 - Follows: 1,325 - Updated: 5/18 - Published: 4/27/2013 - [Harry P., Gwen T.]
Ben 10: Ultimate Hero by Ben 10 Supreme reviews
Ben’s life was going okay . He got a new upgrade to the Omnitrix but he met Nick Fury and starts doubting if he can protect his family. And now he has to deal with one of his most dangerous foes and the military. What will happen from now on (Ben isn't adopted).
Crossover - Ben 10 & Avengers - Rated: T - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 2,954 - Reviews: 2 - Favs: 12 - Follows: 15 - Published: 5/18 - Ben T., Hawkeye/Clint B., Nick F.
Hey Everyone! Concept Idea Time! by Menma Uchihamaki reviews
I'm back everyone! And I'm bringing you a couple of ideas to see which story I should try my hand at. Full details here
Crossover - Naruto & Ben 10 - Rated: K - English - Chapters: 2 - Words: 418 - Reviews: 2 - Published: 5/17 - Complete
Orange Hero's Monster Museum by Artzilla406 reviews
Austin gets transported to a world where humans are getting agented to monsters living among them, so Austin is offered to be a host family and a job to be apart of MONs... oh boy he's going to need a lot of will power to get though this one. (M for Lime scenes)
Crossover - Ben 10 & Monster Girl Encyclopedia - Rated: M - English - Supernatural - Chapters: 1 - Words: 8,159 - Reviews: 3 - Favs: 8 - Follows: 7 - Published: 5/16
Strike of the Storm by Corrodium reviews
Proceeding the fateful battle with Dagon, Ben follows in his grandfather's footsteps, becoming a Plumber. After serving for over a decade, an old foe leads him back to Earth, where he gets caught up with enemies, old and new alike, and a dubious organization that can't seem to leave him alone. When Ben Tennyson thought he had seen everything, he couldn't be further from the truth.
Crossover - Marvel & Ben 10 - Rated: T - English - Adventure/Sci-Fi - Chapters: 5 - Words: 29,763 - Reviews: 44 - Favs: 94 - Follows: 115 - Updated: 5/13 - Published: 5/4 - Ben T.
Ultramatrix Hero Vampire by Artzilla406 reviews
this is the same crossover but what if zack is in this? zack x heram
Crossover - Ben 10 & Rosario + Vampire - Rated: M - English - Romance/Supernatural - Chapters: 13 - Words: 99,923 - Reviews: 6 - Favs: 35 - Follows: 26 - Updated: 5/11 - Published: 2/8/2018
Aliens and a Vampire by Nomadic Chaos reviews
What happens when by an astronomical chance Tsukune recieves the Ultimatrix and the power to turn into aliens, in a school..nee world full of monsters? Find out in this story that details this young mans' misadventures. Rated M for Mature Content and Gore. Tsukune X Inner Moka X Kurumu X Mizore. Includes DXD characters and elements as well. AU story.
Crossover - Ben 10 & Rosario + Vampire - Rated: M - English - Adventure/Supernatural - Chapters: 11 - Words: 77,089 - Reviews: 63 - Favs: 102 - Follows: 112 - Updated: 5/9 - Published: 8/21/2021 - Tsukune A., Moka A., Kuyou, Kyoko A.
Of Spiders, Magic and Aliens by Sentinel of Stories reviews
A story exploring a reality where after Gwen's death from the fall, she is unexpectedly given a second chance at life and discovers she's not really who she thought she was as old forgotten memories begin to surface... memories of her life as Gwen Tennyson.
Crossover - Spider-Man & Ben 10 - Rated: T - English - Friendship/Romance - Chapters: 2 - Words: 2,120 - Reviews: 1 - Favs: 8 - Follows: 9 - Updated: 5/8 - Published: 12/27/2021 - [Peter P./Spider-Man, Gwen S., Gwen T.] Ben T.
Aliens and Magic by Rougedragon reviews
there are countless alternate timelines, in this one, Nanoha and Ben are cousins and their spending the summer on a road trip across the country, fighting off evil from earth or space and making friends with the use of maximum firepower.
Crossover - Magical Girl Lyrical Nanoha & Ben 10 - Rated: T - English - Adventure/Sci-Fi - Chapters: 3 - Words: 36,202 - Reviews: 25 - Favs: 58 - Follows: 63 - Updated: 5/8 - Published: 3/27/2020
Justice x 10! by Nathanael Card reviews
Due to his encounter with Maltruant, temporal and dimensional anomalies have appeared across the multiverse, one of which has trapped Ben in the DC universe with no way back home! While Paradox finds a way to stop the crisis and safely get Ben back to his dimension, Ben ends up working with the Justice League and closely bonding with Supergirl. Will Ben find a way back or be stuck?
Crossover - DC Superheroes & Ben 10 - Rated: T - English - Romance/Sci-Fi - Chapters: 29 - Words: 75,525 - Reviews: 119 - Favs: 237 - Follows: 228 - Updated: 5/6 - Published: 9/10/2020 - [Kara Z./Supergirl, Ben T.] - Complete
Shocking Heroism by Phaze Part 2 reviews
The Omnitrix is the source of many rumors and conflicts, with the power to become anyone. The worst of the worst sought it for conquest and power, the best of the best wanted it to keep peace. But what happens when the tool falls into the hands of a student on Earth? One who struggles with grades and control over his quirk? Well, you get Denki Kaminari.
Crossover - Ben 10 & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Adventure/Sci-Fi - Chapters: 16 - Words: 93,561 - Reviews: 55 - Favs: 117 - Follows: 140 - Updated: 5/4 - Published: 5/1/2021 - Eijiro Kirishima, Hanta S., Denki K.
Ben 10: Alien x Devil by Animes4Ever reviews
Ben needing a break from it all and trying to actually be human again heads to Japan to finish up his highschool education at a place called Kuoh Academy where strangely, no one seems to know who he is despite him being world famous. There's something freaky going on around this Town. Eh, not his problem, he was on vacation. See no evil, hear no evil…..right?
Crossover - Ben 10 & High School DxD/ハイスクールD×D - Rated: T - English - Supernatural/Humor - Chapters: 1 - Words: 4,245 - Reviews: 17 - Favs: 36 - Follows: 40 - Published: 5/4
A Result of Consequence by BigPear reviews
That summer when Ben first found and used the Omnitrix was a simple one. Find bad guy, go hero, beat bad guy, get away, repeat. Ben was on top of the world; in a world full of quirks, he had the coolest one of all. However, every action has a reaction, and Ben's vigilantism has landed him in trouble. Now at UA, Ben must prove himself a hero, or suffer the consequences.
Crossover - Ben 10 & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Adventure/Sci-Fi - Chapters: 19 - Words: 268,054 - Reviews: 647 - Favs: 815 - Follows: 906 - Updated: 5/4 - Published: 11/13/2020 - Ben T., Max T., 1-A Students
Lucy 10, the omniwizard by jackattack999 reviews
Lucy, a celestial wizard of fairy tail with a special power she was giving when she was little: the ability to transform into sentient extra-terrestrial forms dubbed "aliens". she, natsu, happy, grey and erza as well as 2 more aliens get into situations they either accidently or willingly getting involved in and fight the biggest threat of earthland: the powerful warlord, aggregor.
Crossover - Ben 10 & Fairy Tail - Rated: T - English - Humor/Adventure - Chapters: 4 - Words: 16,582 - Reviews: 5 - Favs: 13 - Follows: 14 - Updated: 5/2 - Published: 4/1 - Bivalvan, P'andor, Lucy H., Natsu D.
The predator familiar and zero by Artzilla406 reviews
when koan is relaxing on a job well done, he is now thrown into a new world where he is a familiar for a girl name louise, let's see what he would do for this world.
Crossover - Ben 10 & Familiar of Zero - Rated: T - English - Fantasy/Romance - Chapters: 5 - Words: 45,579 - Reviews: 4 - Favs: 20 - Follows: 20 - Updated: 5/2 - Published: 5/20/2018
The Alien Hero by ninjastorm95 reviews
When the destroyed Omnitrix falls into the ocean to repair itself, one boy is destined to be the world's greatest hero. On this planet and more!
Crossover - Ben 10 & My Hero Academia/僕のヒーローアカデミア - Rated: M - English - Adventure/Sci-Fi - Chapters: 5 - Words: 35,775 - Reviews: 46 - Favs: 142 - Follows: 177 - Updated: 5/2 - Published: 11/9/2020
Ben 10 : Avenger born by Ben 10 Supreme reviews
I'm bad at summaries
Crossover - Ben 10 & Avengers - Rated: K+ - English - Sci-Fi/Adventure - Chapters: 1 - Words: 3,160 - Reviews: 2 - Favs: 4 - Follows: 6 - Published: 5/2 - Ben T., Black Widow/Natasha R., Hawkeye/Clint B., Iron Man/Tony S.
WATCHING THE MONSTERVERSE by ALPHA02FURY97 reviews
THE MONSTERVERSE This Is a Oneshot Book Merge of All my Watching Monsterverse from Book 1 - Book 5 BOOK 1: Godzilla 10 ( 2014 ) BOOK 2: Watching Their Movies Into The Theater World BOOK 3: Jelsa/Kong Skull Island BOOK 4: GODZILLA 10 KOTM BOOK 5: GODZILLA VS KONG
Crossover - Godzilla & Ben 10 - Rated: K - English - Sci-Fi/Adventure - Chapters: 3 - Words: 4,686 - Reviews: 1 - Favs: 10 - Follows: 8 - Updated: 4/30 - Published: 4/27 - Dr. Ishiro Serizawa, Ben T. - Complete
Alien Blade Rebellion by Harem Lover 26 reviews
What would happen if Ben finds the Omnitrix on he sword and sorcery world of Queens Blade? Would he use its power to fight the monster of that world and beyond or join a rebellion against the queen. Ben/harem and rated M for violence and everything Queens blade is know for.
Crossover - Ben 10 & Queen's Blade/クイーンズブレイド - Rated: M - English - Adventure - Chapters: 23 - Words: 142,768 - Reviews: 301 - Favs: 317 - Follows: 275 - Updated: 4/29 - Published: 8/22/2014
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