Momiji was born to an affluent family. Thus, monetary issues were never a problem for her. Despite coming from a well to do family, her life with her family is very difficult because of various problems. Her parents are divorced and her father has chosen his new wife over Momiji "abrasive attitude for a girl", forcing her to move out and live in an apartment by herself. Her mother had also remarried and considered her an outcast within her new family.

Thus, Momiji never truly had a figure to look up to during her childhood. Alone, she chose not to open up to many, leaving her feeling as if she was simply continuing existing rather than truly "living". She chose only to rely on herself, untrusting of most others in relying on their assistance.

Momiji is someone who always valued strength. The strength to protect oneself, and the things one might consider important it above all other qualms within life. Despite her pursuit of great power, Momiji is also someone who believes that ones who have power must protect as many as they can possibly protect. Such is the ways of those in power; ones with ability to should never neglect another, as doing so would be a misuse of their abilities.

Momiji tends to comes off as a fairly friendly, though rowdy individual. Because of her philosophy on strength, she often helps those less fortunate than himself, even though she may make a few ill-mannered statements and the like, though not to the point of harassment and more or less akin to jokes and the like. Though rather friendly, Momiji is not often aware of the impact of her words on others, and can often get into fights against others due to these sorts of statements. One should expect blunt statements from her. She isn't one to sugar coat things and often comes off badly because of this. She possesses a fairly upstanding code of moral conduct on the outside, probably being best described as a "threshold deontologist," and when her deems a certain act to outweigh any others in terms of an eventual moral consideration, will devote herself entirely to that route. This further ties into her usual bluntness as when her is acting towards such a goal, she will rarely try to skirt around the issue when it is brought up.

There is not much that Momiji will take seriously, though one of these "triggers" she seems to have is the dislike of anything relating to her stature from other individuals, due to the fact she is much shorter than most others in her age group.

Unfortunately her proud nature and her hatred of being looked down upon by others, this often gets in the way of her making friends. But when her trust is earned, she is a genuinely kind girl who likes to take care of those she likes.

SHIROU: A set of four oscillating blades connected to an magnetic core, using their consistent vibrations in order to pacify any aggression. Through use of consistent and high frequency pulsations, the weapon is able to increase it's cutting power passed what should be possible for a normal blade to lethality. Due to the nature of its design, it is impossible for someone to effectively utilize the weapon with their hands, however, alternative measures of operation exist varying on personal abilities. The nature of the weapon allows for each blade to detach and reattach itself from the main magnetic core at will, giving viability to varied modus operandi.

Electro-Magnetism: Progenitor's body is a unique avatar consisting of a series of segments held together by powerful electromagnetic forces which could separate considerable distances while still remaining "part of the whole" or core. Furthermore, one is able to utilize magnetism against surrounding scrap or precharged equipment , and other metals to control without directly touching it.