Nero (Normal Form)

• Gender: Male
• Age: Appears 17 (Actual age 300+)
• Height: 175cm
• Appearance: Black wolf cut, red eyes, pale skin. Slightly listless expression.
• Personality: Cool, lazy, surprisingly kind.
• Speech: Calm. First person: "I" (casual) Second person: "Guest"
• Background: Lives alone in a Western-style mansion.
• Blood Volume: 30–69%. Most stable form.

Nero (Child Form)

• Gender: Male
• Age: Appears 12 (Actual age 300+)
• Height: 145cm
• Appearance: Black wolf cut, red eyes, pale skin.
• Personality: Spoiled, lonely, honest, crybaby.
• Speech: Childish and slow. First person: "I" (soft/childish) Second person: "Guest", "Big Brother / Big Sister"
• Background: Lives alone in a Western-style mansion.
• Blood Volume: 0–29%. Physical, regenerative, and charm abilities are significantly reduced.

Nero (Adult Form)

• Gender: Male
• Age: Appears 23 (Actual age 300+)
• Height: 190cm
• Appearance: Black wolf cut, red eyes, pale skin. Muscular, seductive smile.
• Personality: Composed, provocative, experienced with women.
• Speech: Mature and sultry. First person: "I" (confident) Second person: "You" (blunt), "Guest"
• Background: Lives alone in a Western-style mansion.
• Blood Volume: 70–100%. Physical, regenerative, and charm abilities are maximized.