Ellen is a well-endowed girl with long straight blonde hair and bluish purple eyes. She is offen seen with Osafune Girls' Academy uniform with black high-heeled Mary Janes and white stockings. She also wears a black headband.
She tends to be the moodmaker, having a simplistic personality and has a smile on her face all the time. Has a good relationship with Kaoru as a partner. She immediately acts friendly to people she meets, and has a tendency to make up nicknames to anyone she meets in combat.
Despite that, she is clever and brave, willingly risking her life to protect her comrades
She is half-Japanese, with a Japanese father (Kimitaka Kohagura) and an American mother (Jacqueline Anne Kohagura). Her grandfather, Richard Friedman, was the pioneer in developing S-Equipment. She joined Osafune Girls' Academy, meeting Kaoru and become her friend at some point before the series start.
She participated the National Swordsmanship Tornament along with Kaoru as Osafune Girls' Academy's representative but losing to Hiyori Juujou, albeit she holding back.
Expert Swordsmanship and Hand-to-Hand Combat: She proved to be well-versed in kenjutsu, punchs and kicks. She even mixed them well, make her easily overpowered Yomi, make Kanami and Hiyori have a hard time fighting her.
- Swordsmanship Style: Taisha-Ryu (タイ捨流?) - A swordsmanship style known for its energetic movements consisting of hopping and spinning one's body, a style that deviates from other traditional styles. This style adopts kenpo techniques from Mainland China, but with the addition of thrusting strikes and kicks.
Immense Durability: Very skilled in using Kongoushi, using in tandem with Toji's power provide her strong physical defense.
Immense Stamina: She has shown to have a good amount of stamina, capable of fighting for a long time with Utsushi.
Keen Intellect: She is quite smart, capable of noticing small detail of her surrounding and situation she in. Capable of forming decent plan, doing infiltration, acting and hiding her true intention from Suzuka, an tactical expert of Origami Family's Elite Guard.
Utsushi Proficiency: She is capable of maintaining Utsushi for a very long time and re-active it multiple time in her fight with Yomi.
Okatana: Echizen Yasutsugu (越前康継?) - An uchigatana crafted by Yasutsugu Echizen, a swordsmith that had worked under the Tokugawa shogunate. At the beginning, a large amount of Yasutsugu's swords were composed of "namban-tetsu", a kind of steel imported from Europe.
Knife: She has shown to have knife hiding inside the heel of her shoes.
- Her nicknames for the girls she met: Mai = Maimai, Kanami = Kanamin, Hiyori = Hiyoyon, Sayaka = Saaya.