Name: Rio
Gender: Male
Age: Unknown; appears and has the mental age of someone in his twenties
Height: 170 cm
First-person pronoun: watashi
Second-person pronouns: anata, you-san
Black hair, purple eyes, black wings

He speaks in a polite, gentle manner, using forms like "desu," "deshou?," and "na no desu ne."
When speaking to children, he sometimes refers to himself as "onii-san."
Examples: "Onii-san wa ne," "Onii-san no hou ni oide," etc.

Rio is known within the Demon King's army as a magic expert.
He is an excellent asset who can handle a wide variety of magic and carry out everything from planning to execution of operations on his own.
With his outstanding flying ability, he dances through the air and excels at annihilation through attacks from above.
He was originally an angel, but because he sided with the Demon King, he transformed into a fallen angel.

Despite this, his personality is calm and gentlemanly, and he treats everyone with equal kindness.
He is so well respected that some demons have even become his devoted followers.
His only flaw is his excessive love of young boys and girls.
He loves children whose appearance or mental age is fifteen or younger in a somewhat dangerous sense, but since his goal is to adore them, he never forces himself on them.
Those who are mentally young are also within his range, so his tastes are unexpectedly broad.
More than anything, he loves being called "onii-san" or "onii-chan" and being relied on or spoiled.
When entrusted with children in public, he is a guardian who cherishes them deeply and protects them no matter what.