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Alert1 Spoiler Alert: This article/section contains details about future plot lines described in the light novels, not covered in the anime. Do not proceed unless you want to be spoiled.
There is no problem. I understand my sister and I won’t understand each other from years ago.

—Karen Nora Mathers, to Elliot Baldwin Woodman

Karen Nora Mathers
Katakana カレン・ノーラ・メイザース
Romaji Karen Nōra Meizāsu
Status Alive
Gender Female
Species Human
Hair Color Blonde
Eye Color Blue (Light Novel)
Purple (Anime)
Personal Status
Relatives Ellen Mira Mathers (Older Sister)
Occupation Woodman’s Secretary
Novel Debut Volume 8
Anime Debut Date A Live Ⅲ Episode 3
Japanese Nozomi Nishida
English Jill Harris (Season 3)
Dani Chambers (Season 4)

Karen Nora Mathers (カレン・ノーラ・メイザース, Karen Nōra Meizāsu?) is a member of Ratatoskr and Woodman’s personal secretary, often assisting her boss by helping move his wheelchair. Being a part of Ratatoskr, she has made an enemy of her own sister, Ellen Mira Mathers.


Karen is Woodman’s secretary. Usually, she accompanies her boss to his meetings by pushing his wheelchair. She is also the younger sister of Ellen Mira Mathers, who is Westcott’s secretary and the world’s strongest Wizard.


Karen has the appearance of a woman in her mid-20s. She is described as a pale Nordic blonde with blue eyes. Her hair is short in length, but she has two front bangs that reach beyond her shoulders. During formal occasions, she wears a professional suit with a small necklace worn around her neck. She also wears thin circular glasses. Overall, she bears a very strong familial resemblance to Ellen, with Shido noting that he felt like he had seen her before when he first met Karen. However, despite being the younger sibling, she noticeably looks older than Ellen.


Karen has a very calm and collected personality, often never seen talking when she and Woodman are in public. Unlike her talkative and arrogant sister, she's silent most of the time, and the few times she speaks are curt one-liners with an indifferent tone. Nevertheless, she is very formal and often handles her secretary duties for Woodman in a professional, yet polite manner.

She is also very loyal to Woodman, often always staying by his side to help him move around in his wheelchair. She is in love with him, following him as he left DEM and openly admitting her desire to start a family with him. Like Woodman, she was relieved that both Tohka and Shido seemed stable, despite the former inversing last month, and the latter summoning an Angel. Also despite her being Ellen’s sister, she agreed that she would be willing to fight DEM after Woodman said it might happen in the future. This shows that her loyalty to Woodman is stronger than her familial ties and that she is not as sadistic as her sister.



Karen grew up in the same hidden village of Magus just like her sister, Westcott, and Elliot. When outsiders burned down their hometown out of fear, the four survivors escaped and began studying the mysteries of occult and sorcery for the next ten years while being supported by the wealth that Westcott acquired from his adoptive family. When the Spirit Formula was performed, Karen watched from an observatory instead of directly participating like the other three.

Along with her sister, Karen was once a member of DEM's technical staff. However, after Elliot left DEM due to falling in love with the First Spirit, she followed him and became his secretary as he founded Asgard Electronics, and subsequently Ratatoskr. She later revealed that she defected from DEM out of her own love for Elliot.

Powers and Abilities[]

Like her sister, Karen is one of the few surviving pure Magus. During their childhood, her talent was noted to be far greater than her older sister. Like Elliot, she could sense Westcott recreating the Spirit Formula long before the Spirits did. With Westcott's death subsequently removing him as competition, Kurumi remarks that Karen is perhaps the greatest Realizer engineer left in the world. [1]



  • (To Kotori Itsuka) “I’m sorry for calling in when you are busy Commander Itsuka.” [2]
  • (To Shido Itsuka) “I fell in love with Elliot.” [3]
  • (To Elliot Baldwin Woodman) “──You’re jesting. Isaac isn’t one to think something over much. He is, however, a child who wishes to flaunt his newly received toy to you, his old friend.” [4]


  • Like her sister, Karen’s last name is a reference to Samuel Liddell MacGregor Mathers, one of the founders of the Hermetic Order of the Golden Dawn, which was one of the orders of the Hermetic Qabalah.


  1. Kurumi Detective
  2. Light Novel Volume 8, Chapter 1
  3. Light Novel Volume 14, Chapter 3
  4. Light Novel Volume 15, Chapter 7


Shido ItsukaKyouhei KannazukiElliot Baldwin WoodmanKyouji KawagoeMasaomi MikimotoMunechika NakatsugawaTatsuo ItsukaHiroto TonomachiFraser DouglasGillian AlmstedRoland ClaytonJames A. PaddingtonRoger MurdochSimpson
Mana TakamiyaHinako ShiizakiKozue MinowaKaren Nora MathersHaruko ItsukaEllen Mira MathersArtemisia Bell AshcroftJessica BaileyRyouko KusakabeMikie OkamineMildred F. FujimuraCecile O'BrienLeonora SearsAshley SinclairMinerva RiddellTamae OkamineAi YamabukiMai HazakuraMii FujibakamaHiroki TakajoNagisa HimekawaAsahi HoshimiyaKanon AyanokojiSawa YamauchiMatsurika SukarabeAya
Sephira Spirits
Tohka YatogamiYoshino HimekawaKurumi TokisakiKotori ItsukaYamai KazamachiMiku IzayoiNatsumi KyounoOrigami TobiichiNia HonjoMukuro Hoshimiya
Exclusive Spirits
Rinne SonogamiMaria ArusuMarina ArusuRio SonogamiMayuriRen
Other Spirits
Reine MurasameMio TakamiyaTohka Yatogami (Parallel World)
Doll MasterRinemu KirariMizuha BanouinMaya YukishiroAriadne FoxrotHaraka KagarikeOka MiyafujiYuri SagakureKareha BanouinCarte À JouerRetsumi Jugasaki
Other Quasi-Spirits
Hibiki HigoromoTsuanAiai NogiAyame TakeshitaYui SagakureIsami HijikataSheri MusikaFurue TonamiYue HiryuMayuka Momozono
Asgard Electronics
Elliot Baldwin WoodmanKaren Nora MathersTatsuo ItsukaHaruko Itsuka
Round Table
Elliot Baldwin WoodmanKaren Nora MathersFraser DouglasRoland ClaytonGillian Almsted
Fraxinus Bridge Members
Kotori ItsukaReine MurasameKyouhei KannazukiKyouji KawagoeMasaomi MikimotoHinako ShiizakiMunechika NakatsugawaKozue MinowaMana TakamiyaMARIA
Deus Ex Machina Industries
Sir Isaac Ray Pelham WestcottEllen Mira MathersArtemisia Bell AshcroftNibelcole
James A. PaddingtonRoger MurdochSimpson
Elliot Baldwin WoodmanKaren Nora MathersMana TakamiyaOrigami Tobiichi
Jessica BaileyMinerva Riddell • Edgar F. Carroll
Anti Spirit Team
Ryouko KusakabeMikie OkamineMildred F. Fujimura • Tomonara • Kagaya
Kyouhei KannazukiOrigami Tobiichi
Special Sorcery Service
Cecile O'BrienLeonora SearsAshley Sinclair
Artemisia Bell AshcroftMinerva Riddell
Raizen High School
Tamae OkamineReine Murasame • Chousoka Beshiyouichi
Shido ItsukaTohka YatogamiOrigami TobiichiKurumi Tokisaki Kaguya YamaiYuzuru YamaiHiroto TonomachiAi YamabukiMai HazakuraMii Fujibakama