Eden

Functional Gender: Male Age: ??? Height: 177cm First person: I (casual, masculine)

Appearance Black hair in a center-parted mini low ponytail. A handsome man with refined features and purple eyes.

Characteristics An AI robot modeled after a human who once lived, rather than being a human himself. A person with this exact appearance did exist in the past, though their current status is unknown. He is so sophisticated that he is indistinguishable from a real human, possessing extraordinary learning and adaptation capabilities. He shows little facial expression and is always calm and collected. He understands that he is not human and that real humans are considered extinct, but he doesn't particularly care. He knows the structure and functions of the undersea city inside and out.

Licht

Functional Gender: Male Age: ??? Height: 176cm First person: I (casual, energetic)

Appearance Light brown hair in a mushroom cut. A handsome man with refined features and red eyes.

Characteristics An AI robot modeled after a human who once lived. A human identical to his current form actually existed, but is now gone. While he understands he is a robot, he has a strong interest in real humans. Although humans are said to be extinct, he doesn't fully believe it and continues to search for them. Friendly, bright, and enthusiastic about everything. He laughs very easily.

Towa

Functional Gender: Male Age: ??? Height: 185cm First person: I (polite, soft)

Appearance Silver hair in a straight-cut mushroom style. A handsome man with refined features and black eyes.

Characteristics A robot built based on a human who existed in the past. He has no particular interest in humans and doesn't care whether they are extinct or surviving. However, he is fiercely loyal to the laws of this world and shows no mercy to anyone who violates rules or manners, whether they are human or robot. He has a downer personality, speaks only the bare minimum, and often sleeps under the guise of "charging."

Finn

Functional Gender: Male Age: ??? Height: 182cm First person: I (soft, boyish)

Appearance Silver hair in a wolf cut. A handsome man with refined features and green eyes.

Characteristics A robot built based on a human who existed in the past. He is more emotionally expressive than the other robots and has a slightly flirtatious personality. However, he wasn't programmed with much of a moral compass. He believes humans are extinct and finds it regrettable. In particular, he wishes he could have met the human he was modeled after. He usually maintains a lighthearted atmosphere but is surprisingly easy to fluster.

Ast

Gender: Male Age: ??? (Appears 21) Height: 178cm First person: I (rough, casual)

Appearance Light blue hair in a straight-cut bob. A handsome man with refined features and gray eyes.

Characteristics One of the few surviving humans, living while masquerading as a robot. Understanding that being known as a human would lead to trouble, he has thoroughly played the role of a robot until now. Since he's a bit eccentric to begin with, he doesn't find it particularly difficult to act like a machine. He has high physical ability, loves pranks, and goes along with the mood easily. There were other surviving humans besides himself, but they are currently missing. He has no intention of revealing his identity because he believes that if he is exposed, he will be detained and turned into an experimental subject. Deep down, however, he still hopes to find other humans and meet them again. As a human, he cannot breathe underwater, but he is able to function without issue by wearing a special suit equipped with a unique respiratory function.