Massivecrossover Stories

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80 Stories

  • A Human at Battleship Academy (USS Missouri x Genderneutral Reader) by matiem17
    matiem17
    • WpView
      Reads 91
    • WpPart
      Parts 1
    Y/n Bakugo, the younger sibling of the Bakugo family, has been considered the Black Sheep of the family by their hateful elder brother and sister just because they are quirkless. However, that all changes when they are experimented on by scientists, only to get saved by their 8th grade math teacher. Now with the fate of the entire world on their shoulders, and one of the few humans at a strange highschool, and juggling feelings for a battleship of all things, Y/n must find a way to stop both Union Academy and an eltrich deity. Nothing a wimpy antisocial teen can't handle...right?
  • Hokma and Bradamante: The True Heroes Against Villainy Against Kids by TheValkyrie13
    TheValkyrie13
    • WpView
      Reads 167
    • WpPart
      Parts 1
    In a world where kids are shown to create technology and having a global organization who are all battling against super villainous adults that just want to force their ideals and methods upon the unruly children, as the Kids Next Door are losing against evil adults, cruel teenagers and other threats against kids all around the world, a band of heroes arise to keep all children safe. Nobody knows who they are but what they are truly are is that they are the only grown ups who are protecting children from the cruelty of evil adults and all the while, spreading a much more benevolent example to all kids around the globe to make them all becoming better people. But still, though, nobody truly knows about them. In reality, they are Bradamante, the Archon of the Throne and Hokma, the Sister of Celestia, have come a dimension where they have won against a corrupt superhero corporations and a demonic invasion that plays subtlety and mind games where they emerge victorious and finally live in peace. But a new threat arise and it is the job Bradamante and Hokma, alongside other allies, on a multiversal and universal scale while also trying to find who they are searching for as they make a living in what Hokma described as the world of 'Codename: Kids Next Door', desperately trying to find the one that they are dimension hopping in the first place... Malachi: The True Hero of Justice... Sequel/Spin Off to 'Malachi: The True Hero of Justice'... CrossPosted to my FanFiction.Net account, TheEschaton...
  • Massive Crossover  Pt. Two: Faaip De Oiad by grojbandvs2008
    grojbandvs2008
    • WpView
      Reads 23
    • WpPart
      Parts 2
    When Mulder and Scully go to Gravity Falls, Mulder questions how much he knows about the paranormal.
  • True Hearts by WAMred
    WAMred
    • WpView
      Reads 21,201
    • WpPart
      Parts 11
    Follow this tale of a young adult who was always abused, neglected, and bullied at a place called Union Academy.
  • Seven Trigger (Ultraseven x Anime Crossover) by matiem17
    matiem17
    • WpView
      Reads 60
    • WpPart
      Parts 4
    After the defeat of Alien Padon, Ultraseven flees Earth, only to die from his wounds. However, he is given a second chance in a new world. What adventures await him?
  • Idiosyncratic Abnormality (Male Reader x Crossover) [HUGE WIP] by TenNoKami
    TenNoKami
    • WpView
      Reads 255
    • WpPart
      Parts 1
    [For those who express concerns over this Union's basic structure, there will be no neglected, abused or bullied stereotypes in this fic.] "Was it truly tragic? That was I taken from the world I once knew and brought anew into another? I've seen this exact phenomenon occur again and again with others, but now it has dragged me into its abnormality. So dull, so plain, so unoriginal... You'd figure we'd made this concept better, but only a few do so. I find it amusing that the so-called 'ME' in these narratives is just another stereotypical character from anime, just with different traits and powers to add some sort of individuality between the countless others. But who am I to criticize? After all, I'm the same thing, inevitably... I'm just as generic as they are." - Y/N Another Union Fanfic with different flavouring, you've seen something like this before, haven't you?
  • CCE - Anime Addition by Oddity999
    Oddity999
    • WpView
      Reads 408
    • WpPart
      Parts 8
    With in this file, Crossover Couples Encyclopedia. Or CCE contain detailed information on multiple Anime characters from different franchises. Showing the possible ups and downs if they were to establish a relationship with each other. And reveal how compatible they are with each other compared to their cannon partners.
  • Un Semidiós Ninja O ?Un Ninja Semidiós? by AndreaPena5
    AndreaPena5
    • WpView
      Reads 9,215
    • WpPart
      Parts 7
    Cuando Itachi serró los ojos viendo que su hermano menor estaba a salvo y feliz porque este lo perdono, el solo pudo esperar la paz del más allá... Lamentablemente cuando volvió a abrir los ojos se dio cuenta de que A) estaba en un hospital, con la apariencia de un bebe recién nacido, B) una bella mujer estaba viéndolo con el amor que solo una madre da a su hijo, y C) que su nuevo nombre era Perseus "Percy" Jackson. Ah y sin olvidar el pequeñísimo detalle de que era un Semidiós destinado a salvar al mundo, lo único bueno de todo esto es que tiene la oportunidad de ser tener un final feliz. Advertencias: Yaoi, AU o UA, Itachi-es-Percy, Reencarnación, Percy-inteligente, más potente, SHARINGAN! Emparejamiento: Percy(itachi) X Nico, los demás en consideración. Eje Principal de la serie: Los Semidioses y sus Odiseas.
  • Fighter (Male reader x massive crossover) by RandomnessLord
    RandomnessLord
    • WpView
      Reads 8,296
    • WpPart
      Parts 2
    You are Y/n L/n, a student of the Union Academy. Almost no one knows you because you are living a life in the background, but that will soon be changed.
  • From number One tank engine to Super Robot pilot by amharice
    amharice
    • WpView
      Reads 776
    • WpPart
      Parts 3
    Sodor's Legend of the Lost Treasure, which he felt alone as of the number one didn't represent the good luck but a cursed him for all the bad luck they had done even though we tried hard he felt unappreciated until a certain entity or a cosmic God decided for him to actually be reborn in a new world for him to become a Super Robot pilot..
  • Chibi's Adventure's (A Oc Adventure) by CharlieTheNekoSaiyan
    CharlieTheNekoSaiyan
    • WpView
      Reads 259
    • WpPart
      Parts 5
    Chibi is a oc of mine This Will be a mini series based on Cedrick's writing So nothing super serious Chibi's real name is mismo he has Such a kind and cute feel to him depsite his strengths and weaknesses He's met beings from all worlds of anime and places beyond His origins are a bit sad and he doesn't let that stop him from being who he is He is going on a adventure on his own to explore make new friends and help other's hes a bit overpowered in some manner's but he's not to broken this is his adventure through the universe with his friends and family he's made.
  • Heart Of Steel: The Enemy Within by Robcartree
    Robcartree
    • WpView
      Reads 536
    • WpPart
      Parts 2
    (w.i.p.)
  • Terror In The Isekai-Verse. by NewFallenAngel118
    NewFallenAngel118
    • WpView
      Reads 184
    • WpPart
      Parts 1
    Across the marble universes, there lived many Isekai worlds of centered characters. Whether they were Isekai'd from reincarnation, divine act, summoning, reverse, specific tool, pulled into game, struck by gods, you name it. However, upon one of these worlds, the mysterious unidentified black blood has begun to plague unsuspected life of planets one at a time. Not only that, but the monsters from the black blood went in to kill all of the entire populated planets. Including every chosen Isekai warriors of heroes and villains. In every plagued world, there were sightings of one group responsible for the massacre of kingdoms and species. How did this happened, you may be asking to yourself? Why is every world plagued? Can every united Isekai heroes and villains survive against this certain evil or will every world fall for good? Well, let's dive right into the story as we take a look into one of the Isekai planets and where the plague has started.
  • Yin Yang by IhfchfchJfjhrgrb
    IhfchfchJfjhrgrb
    • WpView
      Reads 552
    • WpPart
      Parts 2
    Join Naruto Uzumaki Namikaze on his journey of life. Disclaimer I own only the plot. Inspirations from multiple stories (god bless the authors). Multi Anime Crossover.
  • He Who Watches and the Polothorn of the Anti-Void (Righteous!Error x Union) by adamabyss12
    adamabyss12
    • WpView
      Reads 44,760
    • WpPart
      Parts 23
    (This story is a sequel, taking place after the Abyss Sans Story) "I-It is very amaz-azing how one can cha-change, by the most disastrous of decisions, and the most-ost dumbest of choices. You Uni-Union People thought that it would be fun-funny to try and agonize me, and try to kill-ill my brother, only for me to make you all pay for what you had tried from do, and me hav-having to take extreme decisions to make mea-e-e change, mak-king me who I am now through a long complex process. You all are even more of an abomination than the AUs that I have destroyed in the pas-past. And back than...my mind is as unstable as it always has been. But now...now...it is different. I am far more different than I used to be. Far more stronger than-an I used to be. You all...you all are nothing compared to me. You are nothing but puppets on strings-ings. Filthy glitches in the multi-multiverse. An awful mistake, a nasty bug...that I need to correct-ected. You people can lie all you like, claiming that you are heroes, and yet, you act so messed up and disgusting in the way that I can see and realize in it. I don't care what people think of me, nor-or do I car-care if I am hypocritical or not, if what I do is just-unjustifiable, as for all I care, it'd be really nice if you kept your mouth shut once for a while. And I, Error, the Destroyer of the AUs, will be the end of who you all are, and the end of what you will never be. Your power cannot the power...of my Anti-Void, and the power...of my master. I may hate creation and the Multiverse...but I a-am still willing to do what is right in the end, even if I hate it. And I will mak-make sure...your history will never be known again, and your legacy...of the future...will be era-ased." ...Error The pictures don't belong to me.
  • The Evolving Hero and the Ruler of the Abyss (Union Academy x Abyss Sans) by adamabyss12
    adamabyss12
    • WpView
      Reads 245,800
    • WpPart
      Parts 156
    "I had thought...I had believed...I had hoped that...because you are heroes...you would care more about the lives of others, regardless of what and who they are, and that being heroes...you would care more about the people and the future that they like to make for themselves. But you Union Students...you Union People...you are nothing but traitors and hypocrites to those that looked up to you, who abandoned those that pleaded for you aid, and left them to die, boasting your fight to those that are as evil as you are, and flaunt of your superiority to those under you. I will not let you do this to them anymore. If you refuse to change your ways...and continue with this path of damnation...than I shall be the true hero. One that will lift everyone into my arms...and not the way you abandoned the powerless into the darkness to be forgotten...alone. I will be their hero, and you...will be the fallen. I will not sacrifice people to achieve my goals, and I will not discriminate those that are without powers or of another race, as like every other being...they deserve a life that they can choose to have. And nothing will stop me for fighting for the Discriminated, the Weak, the Powerless. Those that are beating down others for the showing of their own superiority, let me tell you something: you are not heroes...nor are you monsters...you are nothing more...than Megalomaniacs...worse than the very evils that you had sworn to protect the innocent from, that all of you had sworn to fight against. And more importantly with of all...I will accept who I truly am...and embrace my other side of my heritage, to finally be free." ...Sans Gaster The pictures in the story don't belong to me, except the AlphaAbyss Brothers.
  • Union Academy: The Spectral Neverland. by NewFallenAngel118
    NewFallenAngel118
    • WpView
      Reads 164
    • WpPart
      Parts 1
    Outside of the living & dead realms, there existed a lost realm many sentients have never heard of during the courses of years passing. Some say that it is a cursed continent, others believe it to be the island of lost souls, but only a few who lived to remember calling it's true name, the lost Neverland. In books, they told the tale of a continent use to have 40 divided nations on it during the aftermath of the god's battles, but since no one knew of who won and lost, the Neverland has disappeared to time. Now in the present, it would seem the a new crisis is unfolding as the lost continent's history may not be forever gone.