Metal Chao's Roster

Alignment: Neutral Good
A peculiar genetic condition caused Robert's body to slowly turn itself to stone starting from the moment of birth. By the age of twenty he had lost the use of his left arm and a significant portion of his torso, had difficulty moving far due to weight and inflexibility and was under imminent threat of having his heart carbonised, finishing him off.
Conventional medicine unable to help, he turned to his neighbour, a gadgeteer genius and renowned expert in prosthetics, for help. The proposed solution worked... sort of. The original plan was to use nanomachinery to convert the petrified flesh into smaller particles and then hold them in place, allowing them to be manipulated through a device held on the arm. This worked, transforming the affected bodyparts into sand, but unfortunately had the unexpected side effect of also eating the rest of his body and turning that into sand too.

Deciding that he still preferred it to being dead, Robert now lives as a guy made of sand and decided to use his new powers to help other people as a firefighter. As you might expect, what with all the fighting in Brawl City fires are pretty commonplace.
Robert is not a big fan of fighting or violence, and will try to end conflicts peacefully if at all possible. Even then, he will always try to incapacitate rather than kill someone.
He is very easy going and friendly, however he is also shy and has quite low self esteem, and thus does not actually have all that many friends.
He will always do his best to help people that he sees in danger, although in this city that can often lead to some rather unfortunate misunderstandings.

Alignment: True Neutral
Stitches is a biologically engineered supersoldier from another dimension. Unfortunately for himself, their definition of the word "supersoldier" wasn't the same as the usual one, rather meaning "useful but also cheap and disposable" as the army creating them grealy preferred tactics that simply involved throwing troops at things until they went away.
Stitches held one of very few high ranks among his kin, most of whom were lobotomised after emerging from their cloning tubes and directed purely through psychic control, and thus allowed to maintain his sentience as well as a working digestive system. His alloted task was to act as bodyguard to a far more vulnerable person, a task which he failed when his commanding officer (a red haired lass called Brianna) decided she didn't like being an army commander any more, struck a deal with a demon and sacrificed the whole crew to get herself a ticket to Brawl City.
Stitches was the only other survivor, deposited in the white void not too far from her.

Having failed at his life's only purpose, one to which he was actually quite attached, he decided that his new task would be one of vengeance. Unfortunately against Brianna he is rather outmatched, and she could beat him in a fight with a minimal expenditure of effort.
Able to scale walls and leap several times his own height, the city steets are Stitches' new home and he isn't particularly fussy about where his next meal comes from.
Usually found on rooftops or in alleyways rooting through bins for dinner, Stitches' only two goals are finding his next meal and setting up ambushes against the foe he can't possibly hope to defeat.

Alignment: Chaotic Neutral
Brianna shares a background with Stitches. A clone herself, she was bred to sit around in a control room pyschically directing troops. They didn't feel the need to give her any particular tactical genius as they had the resources to just fire pods full of clones at the enemy until they were almost literally buried under a mountain of corpses and they didn't need to give her the capacity to make any good decisions as they instead gave her a hat that would explode if she didn't do exactly what they said in the event that a choice actually needed to be made. She was really little more than a living telephone line to make sure they didn't have to turn up to war in person. Suffice to say, this wasn't really her idea of a good time.
This is why, when their dimensional ship fell into a trap cutting them off completely from home, she took the first chance she got and bargained with the demon that had imprisoned them for her life and freedom in exchange for the lives of all the hundreds of thousands of clones aboard (some of herself) and a lifetime of service.
And that's how she ended up in Brawl City.

Brianna has no allegiance to anyone but herself and nominally to the demon who owns part of her soul. Fortunately for her, all the demon wants is the occasional offering of blood which other people are so willing to donate.
Suprisingly she doesn't find a great deal of amusement in killing people, she just also doesn't see it as a particularly big deal. If someone is in her way and killing them seems to be the easiest option it is the route she will take. She often gives the illusion of glorifying in battle because she is very easily excited.
She is incredibly immature and quickly bored, so she spends a lot of time wandering aimlessly around the White Void and Brawl City or antagonising small animals. She also has a greatly inflated sense of her own importance and combat prowess, will take even the slightest insult as grounds to attack someone and likes to collect trophies (especially hats or anything shiny that catches her eye).
She is so arrogant that she will walk into a trap even if she knows that it is a trap.

What with being a child and also having absolutely no respect at all for any kind of authority, Brianna clearly doesn't have a job or any income and thus also doesn't actually own a house and wouldn't even dream of going to one of the several organisations created to deal with Brawl-related orphans.
She does however squat in an abandoned, dilapidated house just outside the city, while it is not particularly comfortable and doesn't even have a lock on the door or any windows, it is still more comfortable than her old quarters. She generally eats just by wandering into town, seeing something tasty in a shop window and then teleporting it from there directly into her hands. The fact that she can then instantly teleport back to her house makes her someone difficult to catch even when she is noticed.