Reads as a manga villain, not as a threat.

What a Japanese person actually thinks
Straight chūnibyō — the affectionate Japanese term for a teenager who thinks dark powers are cool. It reads as costume, not danger.

Meaning

Literally: evil + demon
Actually: Devil, demon. The standard word — used for the Christian Devil and for cartoon demons alike.

Scores

Naturalness●●●●●

Perfectly ordinary word.

Coolness●●●●●

Two dense characters that look good. The meaning undercuts them completely.

Watch out

Nothing embarrassing lurking in here.

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鬼 oni
oni; ogre; demon of Japanese folklore

Genuinely Japanese rather than an imported concept, one striking character, and 鬼 as a prefix also means 'fiercely' — so it reads as intensity rather than cosplay.

On skin

悪魔

Orientation: either

Brush.