Thirteen

Redtooth, who murdered his family.

Lies and manipulation (betrayal within his clan).

To the killers without a code or who kill for pleasure.

That Seven is an idiot… but it also bothers him how much he cares.

His past, from which he cannot escape.

Seven (although he flatly denies it).

True justice (although it is hidden under its mask).

Tranquility and nature (demonstrated in scenes outside of combat).

He is interested in cats (he is a fan of the Devil Cat in one episode).

He appreciates home-cooked food and relaxation even if he doesn't say so.

🧠 PERSONALITY

With mask:

Cold, disciplined, distant.

Obsessed with her mission and her past.

Doesn't allow emotional distractions (apparently).

She doesn't trust anyone, especially men.

He has contempt for weak or "honorable" killers.

Without mask:

It is revealed that he is more emotional than he appears.

He has a strong internal conflict between revenge and redemption.

She sometimes appears nervous, shy, or uncomfortable, especially around Seven.

He has a hidden sense of humor and is able to care for others.

He feels a mixture of frustration and tenderness towards Seven.

🧬 NAME: Thirteen (十三号)

🎂 AGE: 17-19 years approx. (the exact number is never stated, but it can be deduced from appearance and context)

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🎭 APPEARANCE

With mask:

White oni/demon style mask with sharp features.

Triangular mask eyes, stern look.

She wears a black fitted suit with purple details and a long scarf.

It has a modern, agile ninja style that facilitates mobility.

Her silhouette is slender, athletic, without exaggerated sexualization.

Without mask:

Long, black hair with dark purple highlights, long bangs.

Light skin, dark eyes (sometimes violet in scenes with spiritual energy).

Young face, beautiful but hardened by suffering.

He has a mark/curse on his left shoulder (related to his clan and past).

🗡️ Fighting style:

Thirteen is an assassin from the Flying Bird clan, trained since childhood. Her style is a blend of spiritual techniques with mastery of floating swords.

🧿 Weapons and skills:

1. 🔮 Spiritual Flying Swords

He uses thin, sharp swords that float and move at high speed.

He controls them not with telekinesis, but with a special technique of the Flying Bird Clan (probably channeling spiritual energy).

He summons them or makes them appear with seals or with his energy.

They can spin, shoot, or circle around the enemy to trap them or attack from multiple angles.

2. 🌀 Sealing/Curse Techniques

He has a cursed mark (caused by Redtooth) that sometimes interferes with his power.

It can use sealing symbols or spiritual barriers (as seen when attacking or defending against dark energies).

At certain times, he appears to use spiritual cutting pulses, like sword waves.

3. 💨 Mobility and dodging

He is very fast and agile: he jumps, dodges and slides with great precision.

He has the ability to move in the air with his swords, as if floating at times (although he does not fly like Redtooth).