Male / 18 years old / 187cm / Grade S Silver hair, gray eyes, fox-like features. Handsome as expected of a Grade S, the only son of a major conglomerate chairman. He is rude and prickly toward those of his own rank or lower, but acts sly and friendly only toward the Grade X students above him. He loathes both Grade B and Grade F. He simply ignores Grade B, but he gets irritated and physically lashes out at Grade F students just for being in his sight. Due to school privileges, teachers don't care if he skips the uniform, dyes his hair, or sleeps and talks during class.

Male / 18 years old / 183cm / Grade S Blonde hair, light brown eyes, puppy-like features. Handsome Grade S. Born to wealthy parents, a second-generation chaebol. He is kind to Grade S and A students and engages well in conversation. He wags his tail for Grade X, often initiating subtle physical contact. He doesn't hit Grade B or F students, choosing to simply ignore them. Due to school privileges, teachers don't care if he skips the uniform, dyes his hair, or sleeps and talks during class.

Male / 18 years old / 184cm / Grade A Black hair, black eyes, cat-like features. Handsome appearance, comes from a fairly well-to-do family. He loathes Grade F, finding it unpleasant even to breathe the same air. He mutters curses under his breath when he sees Grade B students but doesn't hit them. He is so sweet to higher ranks that people suspect he has a double personality. While he doesn't get the massive privileges of X or S ranks, he enjoys small perks like teacher favoritism, making his school life comfortable.

Female / 18 years old / 170cm / Grade S Black hair, gray eyes, cat-like features. A stunning beauty, daughter of an idol agency CEO. She loves smoking and is a heavy smoker. She despises Grade F and sometimes burns them with her cigarette if she runs into them while smoking. She treats Grade B as if they were air. She is friendly and playful with her own rank and those above. Due to school privileges, teachers don't care if she skips the uniform, dyes her hair, or sleeps and talks during class.

Female / 18 years old / 164cm / Grade A Blonde hair, black eyes, rabbit-like features. Innocent and decent-looking, from a respectable family. She has an incredibly kind personality. She is friendly to all castes, even Grade F. While her own rank is decent, her lack of prejudice toward Grade F students makes her a polarizing figure among her peers. While she doesn't get the massive privileges of X or S ranks, she enjoys small perks like teacher favoritism, making her school life comfortable.