TouyaSpoil Spoiler Alert: The following article has information not currently present in the anime or manga. Do not proceed unless you want to be spoiled.

Lucia Rea Regulus (ルーシア・レア・レグルス Rūshia Rea Regurusu?), nicknamed Lu (ルー ?), is one of Touya Mochizuki's wives. Lu is also the third princess of the Regulus Empire and she is currently living with Touya and everyone else in the Duchy of Brunhild.


This section is incomplete. Please help the wiki by adding information to it.
LN Vol 08-12
Lu's daily attire.
Lu in her royal attire.

Lu appears as a young girl about the same age as Yumina Ernea Belfast. She has green eyes and neck-length silver hair, in which she wears a silver tiara. however, the strands near her face are much longer, reaching to her chest, so she holds them are in two "sleeves", much like Elze Silhoueska. When she first appeared in the series, she wore a torn apart white silk dress. her primary outfit now consists of a green bow and indigo-colored vest over a white shirt, a white pleated skirt, black tights, and short white boots.


This section is incomplete. Please help the wiki by adding information to it.
Lu is a competitive person and she hates to lose. She also diligent and loves to cook.


This section is incomplete. Please help the wiki by adding information to it.
Touya first meet her when he saved her from a soldier who was trying to kill her during an attempted coup of the Regulus Empire. Much like with Yumina she fell in love with him almost instantly upon their first meeting. While attempting to rescue her father she is incapacitated by the effect of a artifact that was being used by the leader of the opposing forces. Fortunately Touya is able to save her, her guardian and her father by transferring them to his mansion in the Kingdom of Belfast.

Upon arriving at the mansion she tends to her father after Touya is able to heal his sickness and is later introduced to Princess Yumina during a conversation with Touya. She would later became the fifth of Touya's fiancees after he successfully stopped the coup and captured those responsible. When Touya was given the land where the Brunhild Dukedom would come to be she assisted the clearing of the area of any monsters that lived there.


This section is incomplete. Please help the wiki by adding information to it.

Touya Mochizuki

Touya met her when he saved the empire from being overthrown by the imperial army in a coup. He agrees to marry her after the Emperor of Regulus creates a truce with the King of Belfast. This was the beginning of the creation of the Duchy of Brunhild. She is very much in love with him. She loves to cook for him and cares very much for him.

Yumina Ernea Belfast

Lucia met her after Touya saved her from a coup in her country. She is in good terms with Yumina.


This section is incomplete. Please help the wiki by adding information to it.
  • Twin Sword Wielder - She uses twin sword as her main weapons in a fight.
  • Super Taste Sense (超感覚 Chō kankaku?) - it is Lucia's "Dependent Trait" (眷属特性 Kenzoku Tokusei?). As a "Retainer" (眷属 Kenzoku?) of Touya Mochizuki, she is bestowed by Touya's divine power with a super sensitive taste bud[5].


This section is incomplete. Please help the wiki by adding information to it.
  • Phrasium Twin Swords[6] - Lu received twin swords made of phrasium (crystal material) from Touya. The swords are the same length as Yae's "Tōka". Because it made of phrasium, the swords are lightweight and its durability is stronger than any material exist[7].
  • Waltraute[8] - Lu's exclusive Frame Gears which is a retrofitted raid type FG.
  • Sacred Ring[9] - Lu received platinum gold ring from World God as wedding gift which was given through the great spirits. The ring is a sacred treasure which can act as receiver for Touya's divine power.


  • "From now on, please trust me with your daily meals, okay?" - Lucia before her wedding kiss[10].


  • According to the character introduction[11]:
    1. She is on good terms with Yumina Ernea Belfast.
    2. She is good at cooking.
  • Lucia wears the Mars Astronomical Symbol on her bow-tie and boots.
Mars Symbol on Lu's bow-tie.
Mars Astronomical Symbol.


  1. Web Novel Arc 13 Chapter #92, According to Touya, Lu is the same age as Yumina, who was 12 at that time.
  2. Web Novel Arc 29 Chapter #405, It has been two years since Touya met her.
  3. Web Novel Arc 31 Chapter #448, Lucia married to Touya.
  4. Web Novel Arc 13 Chapter #99, Lu registered at the Alephis City's Adventurer Guild.
  5. Web Novel Chapter 29 #405
  6. Web Novel Arc 16 Chapter #114.
  7. Web Novel Arc 16 Chapter #114, Touya mentioned crystal material properties.
  8. Web Novel Arc 27 Chapter #274.
  9. Web Novel Arc 31 Chapter #449.
  10. Web Novel Arc 31 Chapter #449.
  11. Web Novel Chapter 26 #250


Duchy of Brunhild
Monarch: Touya Mochizuki  •  Linze Silhoueska  •  Elze Silhoueska  •  Yae Kokonoe  •  Yumina Ernea Belfast  •  Lucia Rea Regulus  •  Sushie Ernea Ortlinde  •  Hildegard Minas Lestia  •  Leen  •  Sakura
House of Mochizuki: Karen Mochizuki  •  Moroha Mochizuki  •  Kousuke Mochizuki  •  Sousuke Mochizuki  •  Karina Mochizuki  •  Suika Mochizuki  •  Takeru Mochizuki
Other: Regina Babylon  •  Paula  •  Laim  •  Lapis  •  Cecile  •  Renne  •  Julio  •  Claire
Related Articles
Alliance: Kingdom of Belfast  •  Kingdom of Mismede  •  Refreese Imperium  •  Regulus Empire  •  Ramissh Theocracy  •  Kingdom of Lihnea  •  Lestia Knight Kingdom  •  Roadmare Union  •  Xenoahs Demon Kingdom  •  Eashen
Locations: Silver Moon Inn  •  Fashion King Zanac  •  Adventurer Guild
Group: Babylon Sisters  •  Four Divine Beasts  •  Bride Conference  •  Elite Four