Power Makes Your Hair Grow



" Naruto: So Kakashi, do you think Sasuke has gotten any stronger? Kakashi: Can't you tell, his hair is longer. Naruto: What has that got to do with anything? Kakashi: Hello... Dragonball Z"

- Naruto the Abridged Series

Exactly What It Says on the Tin.

So, your hero has just powered up and you need a way to get this change across visually to your audience. How do that? Well let's see... We have glowing with power. Check. Ground quaking. Check. Muscle mass increased by 300%. Check. Rapid air displacement. Check. We've got all the cliches, but there's still something missing... Ah! Of course! Let's make their hair grow out as well!

This is the essence of Power Makes Your Hair Grow.

Now however silly this may seem at a glance, most people will immediately understand that they should now be wary of your hero. It's probably because the sudden appearance of long, unkempt hair can make your hero appear rather feral which may be related to therianthropes since they have a habit of growing lots and lots of hair while becoming far more powerful. Also because even if a character can't see the aura of power, and everything else signalling that the hero just got stronger, longer hair is a little hard to miss.

Sometimes "justified" with a Slipknot Ponytail coming loose.

This is primarily an Anime specific trope, but there are a few non-anime examples out there. Magical Girls are known for this.

Subtrope of Anime Hair. Compare Badass Long Hair.

Anime and Manga

 * Dragonball Z: Trope Codifier, Super Saiyan 3. The first two levels change hair color and add lightning bolts to your aura, respectively. The third level increases your hair volume ridiculously. This has drawn a lot of jokes questioning what a Super Saiyan 3 Raditz (who already has ridiculously big hair) or Nappa (bald) would look like.
 * Lampshaded by Babidi when Goku shows him and Buu the first two levels of Super Saiyan: "So your hair got bigger, what's the big deal?"
 * Running consensus seems to be that Super Saiyan 3 Nappa would look like a Viking.
 * Parodied in VG Cats.
 * Also parodied near the end of Excel Saga, where powering up causes various characters to grow Funny Afros.
 * Yu Yu Hakusho: Near the end of the Sensui arc, and has long, unkempt hair down below his waist, among other cosmetic changes.
 * SHUFFLE!: When in the final episode. It shows her later with her hair braided down to her hips.
 * Revolutionary Girl Utena: in the movie version, Utena's hair suddenly grow quite long from her usual boyish cut during duels.
 * This isn't actually hair growth... the character art designs imply that her hair is braided up. This sets aside the question of how you could actually braid all that hair into the given space...
 * Kamichu!: Extreme example. The main character goes from a sort of pageboy cut to somewhere past Rapunzel when using her goddess powers.
 * Kyo Kara Maoh: When Yuri taps his Demon powers, his hair suddenly grows and he seems to gain a more mature air. It reverses back to his boyish mop once the effort is done.
 * Bleach:  Also from the same series we have Grimmjow, Nnoitra, and Ulquiorra's release forms.
 * which quite possibly made temporarily him the strongest character in the entire series, also gave him the longest hair out of any character we've seen so far.
 * Power Mullets have practically become a meme in the Fandom due to how much Tite Kubo abuses this trope.
 * Mahou Sensei Negima: Negi Springfield during his lightning-god form. His hair becomes as long as he is tall... sort of, as it turns into energy/lighting about halfway down.
 * In Naruto, all of the characters with a Cursed Seal have their hair get at least slightly longer when they go into Stage 2, except Jugo, which is funny considering the Cursed Seal comes from him.
 * Jugo's psycho persona has a considerable amount of control over his transformation; considering there'd be no actual benefit to changing hair, it doesn't. By comparison, the others have to essentially give in to the seal to actually use it.
 * Yu-Gi-Oh! is somewhat of an example. Bakura's hair becomes much 'poofier' when he becomes his evil alter ego. When Marik goes evil it his hair stands straight up. Yugi/Yami is a smaller example, with some of his yellow bangs spiking up.
 * In Hellsing, Alucard's hair grows and retracts according to his power levels (it's fairly short in normal situations, but well past waist-length when dealing with the likes of the Valentine Brothers).
 * In every season of Pretty Cure, whenever the Cures transform, most of the time their hair grows and changes color. Not only that, but they also get different hairstyles (for instance, Tsubomi's red pigtails become an extra long pink ponytail whenever she transforms into Cure Blossom).
 * In Hunter X Hunter, Gon's hair grows when he Afterwards
 * In Angel Sanctuary, Jibril's hair grows back as soon as Sara's soul left her body, a sign that Jibril has regained her power (albeit in a coma).
 * When Ushio of Ushio and Tora uses the power of the beast spear, it usually results in him growing hair past his legs. Should he draw on a remarkable amount of that power? Bring a comb (seriously, it's the only way to bring him back).
 * While Usagi of Sailor Moon already had Rapunzel Hair, in the manga it grew to absolutely unmanageable lengths after she became the Moon Princess for the first time. She locked herself in her room for several days as a result, and the Senshi had to cut it short for her
 * Also Lampshaded later on by Mistress 9  while complaining about how inconvenient super-long hair actually is. Note that her hair invariably trails off-panel in every shot she's in.
 * In the anime, however, not only does she not complain about her hair being inconvenient, she ties her enemies up with it.
 * Happens to  from Vampire Knight, after.
 * While this happens in Yozakura Quartet whenever Akina uses his tuning ability, it's not as drastic as some of the other examples here.
 * Rio of Magical Girl Lyrical Nanoha ViVid has her short, tomboyish hair growing all the way down to her waist whenever she accesses her combat form.
 * In Puella Magi Madoka Magica, Madoka's hair falls to just below the shoulders when it's let out of the pigtails. As, however, she has Rapunzel Hair.
 * In Crimson Spell, one of the ways you can tell when Prince Vald's transformation into his Super-Powered Evil Side is more advanced than usual is when it causes his hair to grow out. He has to re-do his own Important Haircut after such a transformation in the third volume of the manga.
 * In Pokémon Special, when loses control over her powers, her hair grows drastically in length and starts attacking people.
 * Both Hakkai and Goku support this theory in Saiyuki when they remove their power limiters.
 * In Prétear, 's hair grows well past floor length while she's floating when she transforms into the Princess of Disaster. It is shown in a later scene that she is actually quite short in proportion to Sasame. The hair all disappears in the finale when

Comic Books

 * Doc Samson of Hulk Comics has long hair every time he gets into his power phase.
 * It also seems to happen to She Hulk—since with her height increase her hair would have to be floor-length in her petite normal form otherwise.
 * Definitely applies in the 90s cartoon, where normal Jennifer has a Bob Haircut.

Film

 * In Scott Pilgrim vs. the World, Todd's psychic powers make his hair spike when in use. Upon losing them for violating his veganity (long story), his hair sinks back down over his head, limply.

Video Games

 * Sonic the Hedgehog: It's not exactly "hair", per se, but the quills of Sonic act like this when he transforms into his Super Form (or Hyper Form, or Darkspine Form, or...), as do those of any other characters that end up transforming into such forms. It's a direct homage to the Dragonball Z example.
 * in The World Ends With You.

Web Comics

 * The FAN has Pete, a character with short trimmed hair. His hair grows to ridiculous lengths and turns gray (along with his skin turning brown) when his earth-based powers are activated. When he reverts back to normal, he simply sheds it.
 * In El Goonish Shive, Susan's hair grew to knee-length when her magical power and angst received a major spike. She cut it later back to its usual length, presumably with Justin's help.
 * It also seems to be happening to Nanase. Despite having burned out her magic, her hair is growing back rapidly as compensation.
 * This also happens to anyone who is zapped with the V5 beam.
 * In Order of the Stick, Vaarsuvius's hair grew to waist-length after It stayed that way, and s/he now wears a ponytail.
 * This happened to Anne Onymous of The Wotch when.

Web Original

 * In the Global Guardians PBEM Universe, the Israeli superhero Shimshon (the Hebrew form of Samson) has Super Strength that, like his mythic namesake, disappears if his hair is cut.

Western Animation

 * Parodied in Kids Next Door's teasing of the Super Saiyan transformation, where Number 4 gains a 4 foot hairstyle but doesn't actually become stronger, and is promptly kicked away like a soccer ball.
 * A less extreme example than most: Adora gained about a foot or so of hair upon transforming into She Ra.
 * The Rowdy Ruff Boys when
 * The power of aglet awareness made one guy's hair grow back in the Phineas and Ferb episode "Tip of the Day".
 * A side effect of the magic flower in Tangled is that Rapunzel's hair is 70 feet long (mostly since cutting her hair causes it to lose its power).
 * Princess Luna from My Little Pony Friendship Is Magic, when she appears in the second season, has her mane and tail much longer (not to mention flowing and ethereal) than in her de-powered form seen at the end of the pilot episodes.
 * There's a slight length change whenever the heroines of WITCH take up their Guardian forms. Cornelia takes a massive growth (in more ways in one) in "N is for Narcissist" when she ends up wielding all five elemental powers.