Painful Transformations in Fan Works.
Crossovers
- In Amazing Fantasy, the spider bite that gives Izuku his powers wracks his entire body with pain, gives him intense nausea, and makes him sweat profusely while feeling deathly cold at the same time. He ends up blacking out and going into a coma for two days after being rushed to the hospital.
- In The Bridge, Monster X's transformation into Kaizer Ghidorah is excruciating as his bones and muscles rearrange themselves and wings burst from his back in a shower of blood.
- Unleashing of a Dark Night: A WereMobian's transformation is usually painless, only being excruciatingly unbearable if it was forced. Hana, however, being a Chao-Nightmare mix, undergoes this trope hard when exposed to certain triggers with Dark Gaia Energy in them that any of Dark Gaia's minions have left behind; what makes it worse for her is that she could end up going berserk due to it.
- Curiosity Made the Cat is an AU where the apotoxin turns Shinichi into a cat rather than a child. Transforming back and forth is exceedingly painful for him, as his body has to reconfigure itself each and every time.
- In the first story of the Facing the Future Series, Sam's ghost transformation is similar to Danny's. In fact, the author says Jazz will never forget Sam's chilling scream.
- So You Aren't As Human As You Thought You Were: John goes through this when the Chameleon Arc begins to wear off. Though it mostly manifests as sensory overload.
- Abraxas (Hrodvitnon): Zig-zagged and somewhat defied during Vivienne Graham's Metamorphosis inside San's decapitated head. She's kept comatose throughout her months-long gradual transformation, but still, in the first chapter, her spine lengthening causes so much agony that it gets through to her unconscious mind and San has to sedate her further. Later after her rebirth, Vivienne (who at this point has been through a lot of physical punishment) screams in utter agony when San's new head on her back rapidly develops its jaws.
- Against the Moon: Remus's transformations are accompanied by his bones breaking and shifting into new positions. The sheer physical agony he goes through is the main reason why his friends are so desperate to find some way of curing his condition.
- I Hear Him Scream has Toothless curse Hiccup to transform into a dragon himself, expecting his fellow vikings to slay him... assuming he even survives the process, as he half expects it to kill the poor boy outright.
- In Continuation Fic Beyond Tomorrow, Hanyuu endures this while undergoing her first transformation into a full-blooded human, just sitting there crying and groaning in agony while Kagome tries to comfort and distract her from the pain. Inu-Yasha, standing guard outside their hut, reflects that his own first human transformation was much the same. However, it's explicitly stated that only the first transformation is painful.
- Jade Chan's transformation in Webwork into a Jorogumo/Oni hybrid is so painful that the author placed warning around sections the reader may want to avoid. and at one point she has to be placed into a coma for months on end while her skin melts off and her bones dissolve while she grows an exo-skeleton so to avoid months of pain.
- In Blood and Spirit, Link is forced to suffer this gradually throughout the plot of the story, due to his corruption at Majora's hands in a variety of ways, which is slowly turning him into another copy of the Fierce Deity. On the physical side, almost every time the hero enters into a spell of corruption, the chest wound he received in the battle against the original Fierce Deity that started the corruption in the first place reopens, causing him considerable pain. But even worse than that is the mental/emotional side of things. Not only does Majora constantly torment him and threaten him inside his own head, but the demon also vows that it will force Link himself to kill Zelda and everyone else he cares about once the hero has fully succumbed to the corruption and even goes as far to say that this has always been the hero's destiny since he was born. It's no wonder that both Majora and the corruption are revealed as two of the only things Link truly fears.
- Leviathan: On top of all the physical aspects, the further Izuku transforms into the titular beast, the less control he has over himself — and he can feel that agency slipping through his grasp. While he usually manages to keep the worst of it at bay, there's still an icy, prickling sensation that accompanies the manifestation of his scales, claws and tail. If he starts approaching the point of no return, he finds himself snarling and foaming at the mouth.
- In Raindancer, Izuku's first experience with his Quirk began when pressure began to build inside of him to the point that he felt like he was going to explode. He then began to uncontrollably spew an endless amount of water from within his own body, drowning from within as he looked at his mother with tears in his eyes. Then his entire body quivered as it began completely turning into water and collapsed into a puddle. Luckily, he was perfectly alright afterwards and all subsequent transformations are quick and painless, but the event was terrifying for a four-year-old to experience.
My Little Pony: Friendship Is Magic
- In Delusions, transforming into an alicorn is painful. Celestia and Luna's ascensions hurt even more than Twilight's (which involved wings growing and a height change) did because they were originally mules. Celestia can't even describe the pain.
- Chrysalis' corruption by Discord in Diaries of a Madman was extremely painful for no reason other than Discord found it funny. The first time someone uses Nav's gender stones is also very painful.
- In A Hairy Problem, the first werewolf transformation after somepony contracts lycanthropy is very painful, though the pain resides after subsequent transformations to simply being uncomfortable or nonexistant. Applejack (and Fair Vista in Sable Loam's flashback) experience this, and then Apple Bloom and Lightning Dust go through this as well in A Hairier Problem: Rise of the Furball. Applejack has the misfortune to go through this TWICE as her lycanthropy apparently went into regression at the conclusion of A Hairy Problem and Raspberry's dark magic outburst at her trial seems to have brought it back.
- Harmony Theory: Twinkle Shine's transformation into Nightmare Umbra involves all of her bones, tendons and flesh constantly shifting, tearing, ripping apart and healing as she more than doubles in size, growing wings along the way.
- Triptych Continuum: In Triptych, Experienced by her, constantly. Whatever went wrong in the ascension attempt resulted in perpetual cyclical shifting between the three main pony races, moving from pegasus to unicorn to earth pony to pegasus again, and so on through the cycle. Rarity believes the wing bones are breaking rather than simply being reabsorbed. Whether this is true is unknown, but she is in endless, unrelenting agony.
- In You Call That a Costume?, when the Rainbooms are afflicted by a Becoming the Costume spell, it's implied that it was painful for most of them.
- When John becomes water in With Strings Attached, it's not physically painful, but it's incredibly mentally disturbing.
- Similarly, when George becomes an air elemental in The Keys Stand Alone: The Soft World, he feels like he's going to fly apart at any moment.
- In Street Sharks Redux, the canon effects of gene slamming are made even worse. The protagonists feel sick, sore, and confused almost immediately after waking up, which only escalates as they try to figure out just what happened to them. When John starts changing, he's in too much pain to move and basically collapses on the ground. It's later mentioned that the brothers had relatively painless and simple transformations and that adults experienced mutations even worse.
- In Risk It All, Ren's powers, particularly when boosting physical stats like Strength, tend to modify his body in relation to the points he accrued. When learning skills, this leads to a pinching feeling in his brain as he becomes an Instant Expert of whatever he just learned. But after going viral and dumping a lot of points into his stats overall, the sudden change makes him feel like he's dying and every muscle goes taut as he gasps for air. The sensation is so excruciating that he blacks out afterward, waking up the following morning.
