system
Given the following post, respond as if you're commenting on Reddit:
human
[One Punch Man] How are monsters and heroes born?
gpt
Monsters are the result of a genetic mutation that happens when an individual is obsessed with something or have extremely strong feelings towards or about something in some way, always negative. The stronger the obsession and the physical potential of the human the stronger the monster becomes. Some animals have also undergone this type of monsterification

Of course, this is just the most common type of monster. There's also natural monsters such as the Sea Folk and the giant centipedes, organisms that have been subjected to pollution, genetic experiments, people drinking super serums, and people that have eaten Orochi's monster cells.

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The super strong human heroes such as Bang, Darkshine, Flash, Metal Bat and Tank-Top Master were born with their potential to become as strong, and has achieved their level through intensive training.