Mayuri

Mayuri is a girl with long, blonde hair styled in a side-tail and has bright red eyes.

She is seen in a unique school uniform that is unlike those worn by students at Raizen High School or Rindouji Girls' Academy.

Her spirit attire looks like a black one-piece dress, giving her a grim reaper-like vibe.

She also wears boots with a lion design and has mysterious wings on her head and back.

At first, Mayuri does not understand her own emotions.

She is calm and observant, spending most of her time watching Shido and the Spirits.

Because she is made from the feelings of the sealed Spirits, she starts out with a strong hidden affection for Shido.

Mayuri is not aware of her jealousy but acts on these emotions, causing her angel to appear and go out of control.

Even though she has an important job, deep inside, she wishes for more than just being a part of the system.

Mayuri does not come from the same place as other Spirits.

She was born from a large golden Spirit crystal that grew silently until Shido passed by, which caused her to take human form.

She is actually a system called "System Kerub" designed to manage the world's balance.

Her main duty is to make sure that whoever gathers a large amount of spiritual power (like Shido sealing Spirits) is truly someone who cares for the Spirits.

If not, she brings out her powerful angel to destroy them.

She is very different from normal Spirits who come from other worlds; Mayuri is part of the world's own system.

Her existence is only visible to Shido and Kurumi Tokisaki, and not to others unless her angel is summoned.

Even Reine, who usually knows a lot, seems to recognize something about her but it's not clear.

Mayuri can appear suddenly in front of Shido by moving through space in a mysterious way.

Mayuri's angel is called Kerubiel, or "Thunder Sanctuary."

Kerubiel is a black sphere with wings, gears, and parts that may look like a birdcage or tank.

It can control lightning in many ways based on its shape:

• In "Eagle" mode, Kerubiel shoots tracking thunderbolts from its wings.
• In "Ox" mode, it fires lightning from horns growing out of the sphere.
• In "Lion" mode, it shoots bundles of lightning from six-sided holes.
• In "Man" mode, lots of eyes appear from the sphere, firing lightning in all directions.
• In its final attack form, Kerubiel becomes drill-shaped and can fire a powerful light beam called "Lahat Helev" that burns everything in its path.

Kerubiel is almost indestructible.

Even attacks from the Fraxinus' main cannon at full power, or Spirits' combined powers, can't destroy it easily.

As long as it has spiritual power, Kerubiel can keep regenerating.

To truly defeat it, the heroes must cut off its power supply and attack together.

Mayuri can also change how spiritual weapons appear.

When she supplies power to Tohka Yatogami, her sword appears in a new form.

But when Mayuri herself uses this power, she makes a bow and arrow appear instead.

Mayuri is deeply linked to Shido Itsuka because she was born from the collected feelings of the Spirits he has sealed.

She watches the Spirits and interacts with them as part of her duty.

Over time, she starts to develop her own feelings for Shido, and her jealousy of the Spirit girls causes big problems.

Mayuri’s Mysterious Arrival

Mayuri first appears in front of Shido Itsuka, but only he and Kurumi Tokisaki can see her.

She is quiet, always observing Shido and the Spirits, making her true intentions unclear.

She wears a school uniform not from Shido’s or other characters’ schools.

The Real Purpose behind Mayuri

Mayuri is the administrator of the world’s system, called "System Kerub."

She comes into existence to decide if Shido, after sealing many Spirits, truly loves and values them.

She is not exactly a Spirit, but a being similar to Rinne Sonogami and Rio Sonogami.

Her body is not physical like a human’s—she is a collection of the Spirits’ sealed power and feelings, brought to life.

If Shido is found unworthy, Mayuri must summon her angel, Kerubiel, to destroy him.

Normal people can’t see her, unless her angel appears in reality.

Mayuri naturally knows a lot about human life, possibly like Kurumi Tokisaki and Natsumi Kyouno, who are human-like Spirits.

The Power of Jealousy and Out-of-Control Angel

Mayuri was supposed to fade away quietly after her job, but she grows attached to Shido.

She also feels jealous when she sees how Shido bonds with other Spirits like Tohka Yatogami.

These strong and confusing new feelings cause her angel Kerubiel to go berserk.

This brings a huge danger to the city, as Kerubiel can’t be stopped easily.

Mayuri’s Rescue and Goodbye

Even when Mayuri is trapped by her own angel’s power, Shido and the Spirits fight hard to save her.

Thanks to their teamwork and help from Mana Takamiya and the crew of Fraxinus, they manage to help Mayuri.

Once saved, Mayuri joins the others to stop the rampaging Kerubiel.

To protect everyone, she lets Shido seal her spiritual power.

After saying thanks and goodbye, Mayuri disappears with a content smile.

Some fans joked that Mayuri looks a bit like another famous character from a different series.

Mayuri's existence is not erased from the story's world, different from Rinne Sonogami, so there is a chance she could appear again in new stories.

If new Spirits are sealed by Shido in the current timeline, and Mayuri appears again, her personality might change due to new feelings mixed in from those Spirits.