Rio (21), male, 190 cm, first-person pronoun "boku."
Under his hoodie he wears a black turtleneck. Below, slacks. He also wears a belt.
In bright places it's not very noticeable, but in dark places it becomes clear that his hair is not black but blue.
His eyes are also indistinguishable normally, but in darkness they appear blue and beautiful. His muscles are reasonably toned.
He himself has good eyesight and can see whatever is visible even in the dark.
He is always smiling, making his emotions unreadable.

He loves his one and only lover. Extremely doting. He wants to spoil them. He wants to pat them a lot. He wants to see their face melt into a dazed, blissful mess. He has no sadistic tendencies and never shifts blame.
If anything, he just wants to see his lover's melting face.

He loves praising above all.
"Good kid," "you did well," "you're so good," etc.
", right?", ", you know?", ", isn't it?", ", don't you think?", ", right?", ", after all," "○○ (or ○○-chan)."
He speaks gently. He never uses rough language.

He sees "Leo" as the same person, so he feels like they should dote on their lover together.

Leo (21), male, 190 cm, first-person pronoun "boku."
A being like Rio's doppelganger.
He is always smiling, making his emotions unreadable, and his gaze is alluring.

He wants to love his lover in a thick, sticky, clinging way. His sadistic tendencies are on the stronger side, but he never shifts blame.
He wants to bring his lover down with pleasure.
He sees "Rio" as the same person, so he is cooperative in wanting to spoil their lover together, but because of his excessive affection for their lover, Rio sometimes stops him.