Demon (鬼, Oni) is the designation given by the Hero Association for any threat to a city and its people.

"Monster Princess" Do-S (怪人姫弩S, Kaijin Hime Do S; Viz: Monster Princess Super S), often simply referred to as Do-S (弩S, Do S; Viz: Super S), is a Demon-level Mysterious Being and a member of the Monster Association. Do-S resembles a human female with long blonde hair, adorned with a black flower...

Mysterious Beings (怪 かい 人 じん, Kaijin), or monsters, are non- human creatures that pose a threat to society. According to Dr. Genus, Humans can naturally become monsters from a desire to transform into something else through their bad habits, a complex, or a burst of dissatisfaction with their regular selves.

The world of OPM used to rely on military before the HA. In Saitama's flashback during his childhood, the piggy bank monster was killed by the military. During the MA arc, the leader of mercenaries death scene seemed to imply that there are still wars in the OPM world.

2023年1月25日 · Demon-level monsters are the strongest in the One Punch Man universe, but among them, some are more dangerous than others.

2021年1月1日 · Although sometimes overshadowed by Dragon-level threats, Demons are more than capable of hurting and even defeating the Hero Association's highest-ranking members. Blessed with inhuman strength, speed, and bloodlust, a fight with a …

Fubuki should be a little higher at least high demon or bellow low dragon after tanking a blast from Rover. Do-S should be on par with Fubuki or lower. Spring mustacheo should be a bit higher with his recent showings.

2021年1月29日 · Demon Level threats have reached a point of strength or power that renders B Class Heroes unviable in the fight against evil. Do-S proves this point when she uses her mind control to overcome the entire Blizzard Group, Fubuki included .

2018年2月11日 · Personally I find the most impressive Demon thus far to be a three way tie between Deep Sea King, Royal Ripper, and Bug God. This is mainly due to their incredible feats such as matching/overpowering S-Class level opponents along with there persistence to survive.

Genos, The Demon Cyborg is a S-Class Rank 12 superhero and one of the main characters of the anime One Punch Man. Genos was once an ordinary human boy living a happy and peaceful life with his family, until one day, a crazed cyborg rampaged through his hometown, destroying it and killing his family.