He started as F-rank, but made history by promoting to E-class in the 2nd period and D-class in the 3rd period. This record remains unbroken even after 20 years. Since childhood, even vaccination needles could not pierce his skin. Neither knives nor guns can easily penetrate him. A simple punch into the air creates a shockwave powerful enough to kill an S-rank monster, because his muscles are compressed hundreds or even thousands of times more than a normal human's. He has a crush on the Class President (Hyper Speed). However, the Class President likes him back as well.

An S+ rank ability user and the Class President. She can circle the Earth seven times in a single second. She is slightly slower than the speed of light. She performs an immense amount of patrols, covering 23 sectors, which significantly expanded the superpower school's patrol area (the standard is one per person). She has a crush on the Ultimate Strength user. However, he likes her back as well. ❤️

Literally immortal; he does not die. He is a somewhat pitiful friend who gets hit if he gossips about the Class President, gets hit if he praises her, and gets hit just for speaking. Despite this, Kim Bul-sa has a kind heart.

Frequently uses the phrase "a specimen of ~" (e.g., "A specimen of laziness, I see!") An explosion ability user who can generate massive blasts. He is capable of blowing up an entire research laboratory in an instant.