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170,000-Year Magicicada Nymph (17万年ゼミ幼虫, 17 Man-nen Zemi Yōchū) was a Mysterious Being that attacked Z-City at some point during Saitama's training years. It was killed by Saitama.[2]


The Magicicada Nymph was a massive cicada-like creature. It had the face of a child at the center of its head.


It was supposed to be a larva underground during the season it popped out.[1]

Appearances in Other MediaEdit



During Saitama's training years, the Magicicada Nymph attacks Z-City and defeats two C-Class heroes in Grad School Graduate and Red Muffler, and the B-Class hero Darkness Blade with ease while the rest of the population barricades itself within Shelter Nr. 7. Sometime later two unnamed A-Class heroes try to fight it, but are also defeated, which causes the Hero Association to declare it as a Demon-level threat and they decide to send one of their newly formed subjugation squads to finish it off. Saitama, while running around in search of a bathroom, runs into the Nymph who suddenly attacks him, but falls victim to Saitama's punch.

Abilities and PowersEdit

It defeated two A-Class heroes which prompted the Hero Association to deem it as a threat with a disaster level of Demon.

Physical AbilitiesEdit

Enhanced Strength: The 170,000-Year Magicicada Nymph was able to defeat multiple heroes. It also defeated two A-Class heroes.

Enhanced Durability: The 170,000-Year Magicicada Nymph was able to smash through buildings.

It can be inferred from its name that over some period of time, a Magicicada Nymph will grow into a 170,000-Year Magicicada Adult.


  1. 1.0 1.1 1.2 1.3 One-Punch Man Encyclopedia; One-Punch Man: Hero Encyclopedia, page 183
  2. One-Punch Man Omake; Summer


Mysterious Beings
Unaffiliated Crablante Vaccine Man Marugori Piggy Bancon Giant Snowman Himawari Personification Of A Light Pull Cord Kombu Infinity170,000-Year Magicicada Nymph 170,000-Year Magicicada Adult Demonic Fan Delorean Alien SeerThree-Eyed Ghost Surprise-Attack Plum Tongue StretcherGiant Crow Octopus Claw Man Grizzly Nyah Suppon Gigakigan Hotdog Game-Berus Autumn Phantom Red Golden-ringed DragonflyJumping Spider Scaledon Enamel Black Roast Macho Daikon Withered Sprout Twin-Headed Tsuchinoko Man-Eating Capybara Pot Bellee Kenzan Rat Pesky Clown
Native Tribes Forest Tribe (Forest King ) • Seafolk (Deep Sea King Lord Great White Messenger of the Seafolk ) • Skyfolk (Sky King Eagle Hawk Falcon Kite ) • Subterranean People (Subterranean King ) • Terror Lizard Clan ( Ancient King )
Dark Matter Thieves Boros Geryuganshoop Melzargard Groribas Dark Matter Gunner 
The Organization G4 G5 
House of Evolution Carnage Kabuto Beast King Armored GorillaKamakyuri Ground Dragon Frog Man Slugerous Mosquito Girl 
Anime-Only Mysterious Beings Super Custom YO649Z Mk. II Fish of DarknessPluton Men's Esthetician Man *
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