Mukuro Hoshimiya | Valentine

Mukuro Hoshimiya is the tenth Spirit to appear in the series.

Originally, Mukuro had isolated herself from society by living in the vast emptiness of the cosmos. However, she was eventually discovered by DEM Industries through Westcott's . The company then launched a fleet of warships and multiple squads of Bandersnatch units to capture her. Nevertheless, she effortlessly stopped the attack using her Angel and simultaneously dropped artilleries at 42 different locations around the world in retaliation.

Mukuro is a beautiful young girl with a voluptuous figure, possessing a bust considered disproportionately large for her physical age. She has golden eyes matched with flowing blonde hair longer than her own body. She ties her hair together in an Odango hairstyle, and wears ribbons around the buns. To compromise with Shido's concerns about its length, Mukuro lets him tie her hair into a long braid, which she tied around her neck like a scarf. She later requested that Shido trim her hair after her sealing, and she would further shorten it herself about a year later after deciding to move on from her adoptive family.

In her Spirit form, she wears a lilac and white Astral Dress that resembles a Qipao. The ends of her skirt, which are adorned with constellation patterns, are divided at the edge. Dark blue and purple hair extensions which resemble bunny ears are attached to her hair buns. Additionally, she wears transparent purple gloves that are also engraved with constellation patterns. Lastly, she wears high heel shoes that are attached to metallic greaves. These greaves resemble the leg armor used by medieval knights. When using , her Astral Dress gains a more savage appearance, including tassels added onto her hair buns.

Her three sizes are B91/W60/H88.

As a result of sealing away her emotions using , Mukuro bears an icy cold, robot-like demeanor. She claims to be okay with living all alone in outer space and wishes to be on her own. She is quite arrogant over 's power, boasting its superiority to other Angels and her self-sufficiency against DEM's assaults. She has shown her willingness to issue threats and utilize violence to make sure no one disturbs her solitude. However, the fact that she had told Shido she sealed away her emotions implies that deep down, she wants him to save her from her loneliness.

After having her emotions unlocked, Mukuro regained her true personality, which in contrast to her sealed one, is very emotional. Due to growing up as an orphan, Mukuro fears being alone again and desperately wants to remain attached to those who love her. Even after going as far as to seal the other Spirits' memories of him, Shido describes her intentions as being motivated by pure love and innocence rather than any true ill will.

Due to her past with her older sister braiding her hair while stargazing, Mukuro enjoys viewing the stars and is very attached to her long hair, becoming furious when Inverse Tohka cuts it.

In terms of speech, Mukuro speaks in an overly archaic style, formal style often compared to early modern Japanese (Edo period) or Shakespearean English. She often speaks in a third-person perspective by referring to herself as "Muku". She often utters "mun" or "fumun" while thinking.

According to Shido, Mukuro's powers make her a Spirit whose danger level could rival Kurumi Tokisaki or the Inverse Spirits. The latter statement is proven true when Mukuro displays the capability of fighting on par against Tohka in her inverse form, to the point that the latter acknowledged her as a worthy opponent despite her previous scorn toward the "Key Spirit". During the Spirit battle royal, Origami acknowledged Mukuro as a top threat on the same level as Kurumi Tokisaki and Kotori Itsuka. Mukuro can also remain in outer space for an extended period of time without any need to eat or breathe.

Angel: Michael

Weapon: Key Blade

Astral Dress: Eloah

From Reine's analysis, Michael has two different, yet closely related abilities. The Angel has the ability to seal a target’s function by impaling it with a key and can alter the very fabric of space-time by unlocking space to create a wormhole. Overall, Michael is a devastating Angel capable of planetary levels of destruction at full power by sealing the Earth's rotation. It can even seal abstract concepts like emotions and memories. Sealing memories of a particular subject, such as Shido's and her own existence, can be done on a large scale, making even the A.I. MARIA incapable of recognizing Shido. However, while Tohka and Origami were deprived of their memories of Shido, their alternate consciousnesses (Tenka for the former and the new timeline Origami for the latter) were unaffected. Her adoptive family's memories of her remained sealed even after Mukuro lost her Spirit powers, and Asahi was only able to regain her memories after reuniting with her. Additionally, the usage of her wormholes allows for a method of instantaneous travel and unparalleled range in coordinating long distance attacks in the form of redirecting debris.

After being sealed, Mukuro notes that the maximum range of her wormholes has become drastically shorter. Despite her weakened state, she is still strong enough to open up multiple portals to send her companions to various locations in Tengu City in order to save their civilian friends from DEM. However, this issue is later resolved after Mio provides power ups to each Spirit, giving them full access to their full powers again. Likewise, she has full access to her powers when in Tenka's world. During the Spirit battle royal, upon Nia's commands, she was able to open up a gate large enough for numerous copies of Maria to ambush the Yamai sisters.

So far Mukuro's Angel, Michael, has shown to have the following abilities:

Segva: Seals away certain functions of the target. Mukuro first used this ability to shut down DEM's machines and Fraxinus' satellite Realizers. As seen from Shido's example with his copy of , she can also seal the ability of other Angels. At full power, she claimed that it could be used to stop the Earth's rotation. Although when she attempted this, there was a delay due to the overall size of the target, and the Spirits were able to delay it further by channeling their Reiryoku into the ground via Yggdra Folium. Lataib: Allows Mukuro to open up holes in space that can be used to teleport herself, summon forth meteorites, and redirect incoming attacks. Shifuru: Unleashes the true potential of by transforming it from a key-shaped khakkhara to a Chinese halberd. When in this form, can be used to awaken the hidden power of other Spirits as well. Jerez: Decomposes Reiryoku and the bonds holding molecules together. First used during her battle against Tenka to annihilate the Inverse Spirit's Astral Dress and the surrounding buildings. Tefete: Shrinks down to a miniature version small enough to be held easily at the palm of a person's hand. Although Mukuro has yet to use this ability herself, she instructs Shido to use this form when trying to unlock his past memories of Mio, as the Angel's normal size proved inconvenient to direct at his own head. This causes Shido to wonder if Mukuro had also used Tefete in the past when she sealed her own emotions. Unnamed Energy Beam: From the tip of 's key, she can launch a concentrated beam of Spirit energy that can pierce through anything.