This is my article and please be civil not to vandalize it otherwise I will invoke the wrath of Great Holy Knight Robo and the other superiors in this wiki. Feel free to correct any mistakes in my grammar but none of vandalizing here and now.

This page, Martha, is currently under construction. Please bear with the changes made by the author.

Kanji/Kana マーサ
Rōmaji Māsa
Alias Red-Eyed Killer Knight (???,???)
Biographical Information
Age 700+ (chronologically)
20s (physically)
Race Human/Demon
Biological Description
Gender Femalesymbol Female
Height 164 cm (5'4")
Eye Color Red
Hair Color Black
Blood Type A
Occupation Member of the Seven Deadly Sins
Affiliation Seven Deadly Sins
Abilities Death's Poison
Sacred Treasure Deathkeeper
Symbol of Beast Owl

— Mary


Martha「マーサ」 is a member of the Seven Deadly Sins and is the Owl's Sin of Vanity as their eighth member. She is also infamously known as the Red-Eyed Killer Knight.


Martha is a young girl with long black hair that reaches down to her knees and red eyes. She wears a dark sleeveless mini dress with a white collar and a red tie; she wears a red belt that has a red side skirt cover. She wears it with long black socks and black shoes. She also wears red gauntlets and black gloves, sometimes wearing a coat during battle if she felt like it.

She may look like in her teens, her age is actually 700 years old.



Infamously in Britannia, Martha came to be known as the "Red-Eyed Killer Knight" due to her opponents looking her red eyes that signals death awaits them.

Martha had joined the Seven Deadly Sins as their eighth member, the Owl's Sin of Vanity in exchange for clean slate of her grave crimes of murdering lots of people in the past. She served as the legendary group of knights' black ops member assigned to deal with hindrances and potential foes, working in the shadows while the Seven Deadly Sins fights in the open.



Although considered as the "weakest" among the Seven Deadly Sins, Martha is a highly skilled in assassination and hand-to-hand combat. Her lack of presence/killing intent makes her the second most dangerous besides Meliodas. Martha possesses a strange ability to enter a form similar to a Black Mark Mode, that only Demons and those who drank Demon blood can use, granting her immense boost in speed and strength, as well as increase of magical power.
Martha's Demon Mode

Martha's Demon Mode




  • This character is based from Akame from Akame ga Kill! and the latter character is the MC of a crossover fanfic of mine, Akame no Taizai