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Multiversal Agent by Neko_crazy123
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics), Multi-Fandom
07 Jan 2026
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-William Clockwell, you've been chosen to be one of our agents.
-....Am I on drugs or something? What the hell is this? Is this a dream?-
-No dreams, this is real, and now congratulations... welcome to the agency.-
-...how the hell did I end up here...-
-Well, you weren't the first choice, but you were the closest thing to replace me?-
-......son of a bitch....-
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In this fic, William will have dangerous and fun missions.
And he'll find himself traveling to different universes.
Series
- Part 1 of agents in action
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Agente multiversal by Neko_crazy123
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics), Multi-Fandom
07 Jan 2026
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—William clockwell ,has sido elegido para ser uno de nuestros agentes
—.....¿estoy drogado o algo así? ¿que mierda es esto? ¿Es un sueño?—
—Nada de sueños,esto es real y ahora felicidades... bienvenido a la agencia—
—....cómo carajo termine aquí...—
—Bueno no fuiste la primera opción pero fuiste lo más cercano para remplazar —
—......hijo de puta....—
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En este fic William tendrá misiones peligrosas y divertidas
Y se encontrará viajando a diferentes universos
Series
- Part 1 of Agentes en acción
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Durante el evento multiversal conocido como la "Invencible War", William Clockwell se ve atrapado en el caos cuando su universidad se convierte en un campo de batalla entre múltiples versiones de Mark Grayson / Invencible. Tras ser salvado de morir aplastado por los escombros por Rick Sheridan (su "casi algo" ), William es "rescatado" de forma abrupta y posesiva por una variante de Mark proveniente de otro universo.
Este Mark, cubierto de la sangre de sus enemigos y con una obsesión protectora y romántica hacia William, lo secuestra para "mantenerlo a salvo", arrancándolo brutalmente de su vida y de Rick. William es llevado a un refugio donde descubre que no es el único: varias otras variantes de Mark (Mohack-Mark, Emperor-Mark, Viltrumita-Mark, Sinester-Mark, Masked-Mark y Fullmask-Mark, omni-mark) han hecho lo mismo con sus respectivos William, creando un harén multiversal.
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William is the healer of the hero’s party. He and his friends, Markus the hero, Eve the mage, and Amber the druid, are destined to defeat Markus's evil twin brother, the demon king.
One problem though, the demon king is in love with William.
WillMark RPG AU -
We are yours, William by Neko_crazy123
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
06 Jan 2026
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Well, this is unbelievable. First, your best friend, Omega, and now your partner turns out to be half-alien. Then his father becomes a murderer trying to conquer the planet, only to disappear for months... and it doesn't end there. Then your partner goes into space for several more months, supposedly to help a strange grasshopper race, and returns with a purple baby... and of course, it gets even better... several murderous variants invade Earth to make Mark look bad... and well... All the remaining variants want you as their alpha... this is going to be tough.
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Somos tuyos william by Neko_crazy123
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
06 Jan 2026
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Bueno esto es increíble, primero tu mejor amigo Omega y ahora pareja resulta ser mitad alienígena,luego su padre se vuelve un homicida que busca conquistar el planeta para luego irse por meses.....y eso no termina,luego tu pareja se va al espacio por otros meses según para ayudar a una extraña raza de saltamontes y regresa con un bebé morado....o y por supuesto esto se pone mejor.....varias variantes homicidas invaden la tierra para dejar mal a mark......y bueno.
todas las variantes que quedaron te quieren como alfa.....esto si que será difícil.
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When there’s a… by CalliopesScribbles (CassandrasEchoes)
Fandoms: Invincible (Cartoon 2021)
06 Jan 2026
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William isn’t an idiot, he knows Mark is keeping something from him and he wishes he’d stop noticing these new walls his best friend keeps putting up. What’s going on with him that he can’t tell William about? What’s up with this talking book Williams found? And what do you mean the GDA’s taken an interest in him?
Meanwhile Marks trying to find something that makes sense in a world where he just got his powers, the Guardians of the Globe are dead, and his dad’s really set on training him as a hero. But even though he’s a hero now and by all means should get a girlfriend like hero’s in comics do, why doesn’t it feel right? Why do the butterflies in his stomach when he’s close with girls make him uncomfortable instead of feel in love? And what do you mean William will be a hero with him too?
[basically my take on maskless Mark and his William]
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Dive into my ocean eyes by ShinRock
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
06 Jan 2026
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Aveces parece que le pedís al universo algo y quizás te da mas de lo que alguna vez pediste, aunque quizás venga en forma pseudo alienigena.
William no tiene la mejor vida del mundo, lo sabe perfectamente, siente que tiene que cargar con cosas que cree que nadie de su edad debería, aunque por momentos piensa que se lo merece. Hasta que aparece un simpático y parlanchin niño de ojos marrones y cabello negro, que poco a poco hace que su perspectiva de ver las cosas cambie, con una linda amistad de por medio.Es la primera vez que escribo un fan fiction en 8 años, y la verdad no me costo tanto, pero espero poder una historia decente para un fandom pequeño (que amo mucho) que siento que necesita muchas mas historias interesantes, agregare etiquetas a medida que avance la historia.
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Turns out, worldwide terrorism doesn’t account for overworked college students taking naps.
Or—The Invincible War starts after you finish working a full shift and, somehow, the day only gets worse from there. You would’ve appreciated a heads up that multiple variants of Invincible have unfinished business with you.
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Habían quedado para pasar la noche de Halloween y hacer cosas en pareja, una normal, por primera vez en mucho tiempo. Mark llega tarde, como siempre y William encuentra una sorpresa inesperada por parte de su novio... ¿O no?
(Variante de Mark con mostacho y uniforme viltrumita x William)
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Maskless and William are happy
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Réquiem Viltrumita by tastelikehoney
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
04 Jan 2026
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William Clockwell es capturado y sometido a un experimento. Mientras cambia, se enfrenta a versiones de Mark Grayson y descubre que su destino está ligado a la supervivencia de una raza en extinción.
¿Dónde está el verdadero Mark?
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Regresa a casa Mark by VcJoss
Fandoms: Invincible (Image Comics), Invincible (Cartoon 2021)
04 Jan 2026
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Mark pelea junto a Eve y otros héroes en las calles. Sus variantes con el traje de Omni Man y aquel con pañuelo vuelan sobre ellos.
Mientras pelean, aquel con el traje de Omni Man se lanza al ataque de Eve. Trata de detenerlo, pero el del pañuelo lo intercepta. Lo golpea con fuerza alejándose, y vuelve a poner su atención sobre su novia. Atom Eve crea un escudo tratando de poner distancia, pero el otro Mark lo rompe con facilidad.
Estira el brazo con intención de agarrar su pierna. Pero antes de poder tocarla. Algo lo golpea por la espalda, mandándolo al suelo.
El extraño viste un leotardo negro, que se pierde tras las botas militares y le cubre hasta la nariz. Con una chaqueta roja y un cinturón gris. El desconocido voltea a ver a la otra variante con el pañuelo, que se alza gritando maldiciones. Pero antes de que vuele para golpearlos, otra figura lo golpea con fuerza en la espalda.
De repente hay dos extraños, un hombre y un niño que acaban de salvarlos.
Series
- Part 1 of Encontré una familia
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Warning you now, I cut the smut off at the end. My apolocheese. I will make it a separate chapter tomorrow
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William runs for his life as the world is ending. He sees Mark and calls out to him. Thinking he is saved. Only to realize far too late that it’s not his Mark, but a variant. William is not to be killed, like countless others. No, this variant has very different plans for him.
Maskless Mark X William
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He Who Killed The Sun by Sagearie
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
01 Jan 2026
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William learns many things on this new earth.
The first lesson is you can’t run. The second lesson is that you can’t hide.
He stands there, on cool tile, in a palace with pillars stretching into the heavens. It’s not until he looks over that too-high balcony that he sees it—the flickering of blue amongst a sea of white, some of them adorned in jewels far too heavy for their necks. They’re aliens, the ones donning blue cloaks. Some of them have more eyes than William can count, others with another pair of arms or legs. Yet, they all don the same white band around their neck. If you squint hard enough, you could see the glimmer of its metal sheen.
That’s when William learns his third lesson.
The Viltrum wear white.
Their pets wear blue.
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Or!! Mark's guide on how to NOT create a nuclear family
*Index in first chapter
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I Don't Know What I Can Save You From by DitchLilies
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
31 Dec 2025
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Life for William has been nothing but a disaster ever since his childhood friend and old crush Mark Grayson became Invincible. Turns out almost being murdered and stuffed inside a robot body has some negative effects on a guy's mental health. His only reward for surviving was a GDA non-disclosure agreement and an anxiety prescription.
To top it all off, his boyfriend just broke up with him and his best friend is nowhere to be found. William feels forgotten, left behind to deal with everything alone.
Mark is trying his best. Still shell-shocked after finding out his murderous father is alive, banged a bug, and had another kid. Between being a superhero and now a big brother, he doesn't notice that his best friend is being targeted by someone determined to discover Invincible’s secret identity, no matter the cost. -
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William was enjoying his life as a fox. Until a hunter trapped and shot him. William barely managed to escape and survive.
For his own safety, William disguises himself as a human. Then starts to attend university. Only to find out that his dorm roommate is the same hunter who shot him.
A hunter who is completely obsessed with finding William and turning him into his trophy.Hunter Mark X Kitsune William 🦊
Series
- Part 2 of Shelter for abused Williams
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Not even death can do us apart by Annie_cat
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
30 Dec 2025
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In every universe, Mark Grayson eventually falls in love with his best friend William. The circumstances may be different, but the feeling is always the same. However, in each universe something happens to William, leaving Mark all alone, grieving. Unable to forget their loved one, the variants accept Angstrom's offer of fulfilling their every desire, as long as they destroy another Invincible's dimension. But how are they going to be with William, if they're obstacled by themselves?
Sorry I don't know ho to write a summary and english is not my first language, so sorry if something may not have sense, but please give this fic a chance <3
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Cruel Power by Parvel
Fandoms: Invincible (Cartoon 2021), DCU (Comics), Superman (Comics)
30 Dec 2025
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It was the first day, their first god damn day in college, and Mark had to leave to save the world or something, leaving Will alone and taking care of his stuff, yet again.
AU for when Mark left to save the thraxans and William stayed alone in college for months, becoming a vlogger, having a situationship with Jay Nakamura, developing an underwear kink and becoming a semi famous onlyfans model until Mark inevitably comes back.
Slow burn for an endgame between William and Mark
- Language:
- English
- Words:
- 1,820
- Chapters:
- 1/?
- Kudos:
- 12
- Hits:
- 107