Will get to that when I,m not limited to my phone. The devil part I added in because compared at least to most of the others, She's severely lacking in the righteousness department. So I thought a darker theme might work.
While initially quiet and shy around people she doesn't know, The moment she gets over her anxiety she becomes a more personable person.
If you get her talking you'd find that she's quite frank about pretty much everything and she exhibits a healthy amount of sarcasm.
While generally a good person, she is not above comitting selfish acts and petty crime sometimes she doesn't even know why she does it.
All of these however are just a mask, a veil to protect the broken core of someone who's fallen far.
Skills:
She's is reasonably intelligent enough to figure things out reasonably well, just don't expect her to get you to the moon. She'd balk at the thought of doing so much arithmetic. She's capable of quick thinking and figuring both orthodox and unorthodox solutions to a problem.
She's good at computer stuff, but not like she's able to hack into the security network or anything, it's mostly skills she's able to pick up with her online experiences.
She can cook just about anything as long as she's provided with what's needed to make said food in the first place.
Brief Backstory:
Everything was going fine and dandy for Aki, she had good grades, almost always at the top of her class, she was athletic, her family was well off and she had a promising future. She was almost perfect, until she wasn't. One thing lead to another and she failed a subject, which means she has to retake it in the next year. But not wanting to be held back she lied. She lied to her parents, saying she passed, and she lied to her school, making her advance to the next year without having to take the subject she failed. It was all good, she went around instead of over that hurdle, and nobody but her knows. It went on like this for a few years but one day what she dreaded happened, life caught up to her. Her school found out and invalidated what she achieved for the past three years. She was devasteted. And her parents really didn't take the news too well to put it lightly.
After all that, the once promising future she had turned into an uncertain one. What was once a bright young girl with her life ahead of her has turned into a NEET of a young woman. With strained relations with her family, she spends most of her time doing odd jobs online or walking around town moping thoughts of ending it all come and go ever so often whenever she thinks back as to how far she's fallen. And it was during one of these moments where she's in the figurative rut of despair that she encountered a dark creature. It was a vaguely humanoid shaped mass of writhing shadows with white streaks. At first thinking she was dreaming, she approached, curiosity suppresing caution. As she drew near she reached out to touch the creature.
*CRACK*
Was the sound of the branches of the sapling she was thrown onto when the thing slammed her with an overgrown fist. It was the dark creature's turn to approach her. As she struggled to get to her feet she entertained a thought, this could be her freedom from her mistakes, a way out. A part of her relished the idea of dying, hell she didn't even have to do it herself, it would be a fitting end to a girl who never failed to live up to what was expected of her. She smiled, and cried at the same time, deep down in he core, beneath all the anguish a part of her went "I wish I could have done something good with this damned life". And that was when the monsters fist smashed right through her ribcage, crushing and pulping her lungs and heart. The last thing she saw was a bright lavender whisp behind the creature that ended her.
"That... FUCKING HURT"
She yelled... She yelled... She looked down at herself and she was fine, no massive bloody hole where a creature of darkness punched her. She looked back at the creature, she was now some distance away instead of under it. And that was when she saw it. The creature's arm was still stretched out and down, and at the end of it was HER lifeless body, a gaping bloody hole in the chest. Overcome with so many emotions, ranging from confusion, to curiosity, to rage, to pain and then madness. With a growl she rushed at the creature and a furious battle ensued. And she lost, she lost many times, but every single time she is seemingly killed, more of HER appeared. And thus she fought creature for over three hours. And through all that a fairy with lavender wings was hiding behind some bushes watching the confrontation... and the fairy murmured...
"What have I done?"
And thus the girl who lied to her family, to her friends and most of all, to herself, the girl who have sinned, was given a way to repent. She would learn the true nature and quirks of her ability in due time and come to embrace it. And she would do battle with the fiendish darkness, unknown to her the very first one she killed was an amalgamation of her own suicidal thoughts, her emotional agony. And in time, she would both love and hate these battles and she would evolve because of these.
While she isn't any stronger than she is untransformed, she is substantially more limber and dextrous.
Her ability is multiplication, of herself and simple objects she has a complete grasp on (like clothes, dirt, rock and other such things). She has termed these copies of herself a 'number'.
The characteristics and capabilities of the numbers are equal to one another, they all share her mannerisms, her quirks and her personality. They do not share any psychic mind link with one another, however all experiences of a number that's recombined with another is shared in full, Unfortunately this includes unpleasant experiences.
Each one of them has an innate sense of what direction other numbers are, so if one gets lost they would know in which direction to go to hopefuly find the others.
Every number is recombined if any one of them decides to undo Aki's transformation. Otherwise recombining between numbers is accomplished by physical contact with each other.
Due to the lack of psychic connection between the numbers, Aki's ability to utilize them is limited to how effectively she could have her numbers communicate with one another, and since she cannot materialize something as complex as a phone or even a walkie talkie she has resorted to visual means of sending messages, and also yelling. In such a way she has given her numbers a military style structure albeit an outdated one.
With such a structure her primary form of combat is almost entirely conventional, save for the fact that her small army is composed of lithe little devilish magical girls. While she cannot ever hope to equip them with any sophisticated modern weaponry, pikes and swords and bayonets and antiquated firearms are doable although she specifically prefers percussion primed bayonet equipped rifled muskets as these provide a rounded capability in both long range and close range engagements.
Now while it doesn't really take much out of her when she multiplies into numbers. The numbers do form with the same state of fatigue as what formed them. So if she's tired and sleep deprived and she multiplies, she just turn into a larger number of tired and sleep deprived girls. As such it is benefitial to form more numbers from one that isn't fatigued. The most exhausting thing to her however is when she recombines as the fatigue of any number that's recombined compounds that of the one that absorbs them. So one tired girl turns into one hundred tired girls, but one hundred tired girls will turn into one utterly exhausted girl. In addition, the nutrient needs of each number is no less than that when she's not transformed. As such she definitely benefits from having satiated her stomach before doing any multiplication.
It takes a whole second to make a number, but each number in turn can make more, thus the speed of her multiplication is exponential, with the rate being at it's lowest with smaller numbers. It takes similarly a brief pause to materialize any new object such as equipment and the like. In terms of total deployable, it's only limited by how effectively she could coordinate everything. Although 6000 is her self imposed maximum as any more and the physical and magical burden on her when she finishes a fight is debilitating.
While the most obvious advantage to her ability is that she will almost always outnumber her opponent. It has a number of practical non-combat uses. Ranging from an instant multiple pairs of helping hands to entertainment, she can literally play chess with herself with her ability.
"Artillery is the God of War, and I have the four Apostles"
The most destructive weapons she could muster are her artillery batteries, antiquated but effective. The first battery, her archetype are the Four Apostles. A quartet of bronze pieces sitting on red carriages, named after a similar set of weapons used during the American Civil war. These four will always accompany her in any battle that's worth their use. And while it takes her upwards of ten minutes to form a new battery of artillery (consisting of four pieces and the accompanying crew of numbers of which there are ten per gun), the four apostles will always be immediately ready to support her should she need them.
Standard Maneuvers
In order to streamline her ability to fight effectively given the lack of psychic communication between the numbers and the inneficiency of simply yelling instructions over the din of battle, she has come up with various maneuvers that are given a specific command that each number would be drilled to know how to do. In addition various maneuver commands can be combined to perform the needed task.
Crane
This is the stereotypical encirclement maneuver that would result numbers at either end of the formation to advance forward in order to surround the enemy from three directions. The disadvantages of this formation is that usage of firearms for the left and right flank is limited since there is real risk of friendly fire.
Ram
Specialized formation for melee breakthrough combat, which has the numbers form up into a large square or column that then advances towards the enemy with the intention of overwhelming them with concentrated weight of numbers. The disadvantage is the fact that the formation inherently makes it incredibly vulnerable to range attack.
Loose Order
In which the numbers will keep a reasonable distance from one another and utilize whatever cover is available to reduce the chances of one strong hit taking out multiple of them at once. The formation is not effective in melee as the distances between the numbers mean that they take just that much longer to come to the aid of any one of them that's being assailed, however it is good at exchanging ranged fire with the enemy.
Drizzle
A firearm specific command that has the numbers stagger their fire by rank or if possible via countermarch. The purpose of this is to keep the enemy under a constant fussilade of gunfire with no respite provided they aren't interrupted and ammunition supplies last.
Hailstorm
Similar to drizzle, except fire is by batteries of her artillery, and is only possible if she actually has deployed artillery on the field for obvious reasons. Given enough guns and enough time, this could reduce even fortress grade fortification or shielding.
Personal fighting abilities
While she has an almost complete focus on formation fighting she still has somewhat developed her ability to fight singly. Although development was still somewhat limited.
Self Arm
Her ability to immediately arm herself with a simple but effective weapon for whatever situation she finds herself in is her second most important ability in personal combat, the first being her lithe and limber body utilized in whatever way she needs to disengage from a fight.
That sort of just kills the character development ark everyone would have had. Their first interactions and whatnot. Aka killing the best part of a crossover roleplay.
I propose making the characters with inactive players NPC's for the time being.
Chris rode a missile from the lower docks up higher (but not all the way to the top) of the station. And Sasaki and Mami was proceeding deeper into the station a fair bit before Chris tripped on the ribbon. So Samus and Kirby would be the closest characters aside from the VIP folks.