So! After cursing my lack of reading comprehension and hitting my head a few times, I have further modified the character's backstory. Keeping the themes (Revenge, humiliation, opportunity to gain power) and now hopefully having a backstory more in line with this roleplay. Though few considerations, if there's more modification needed:

1) Do you think that gang would be able to steal blood? Perhaps not from church itself, but from Yharnamites? 
2) Would the Fire Dancers attack gangs like these? Possibly yes as they'd be smuggling goods, like blood.
3) Speaking of smuggling, would it be a plausible idea? I'd imagine not everyone is welcome to Yharnam, but man would have need for the blood, hence smuggling.

[Hider=Marcus the Rat]
[b][u]Race:[/u][/b] False Paleblood Hunter
[b][u]Age:[/u][/b] 25-ish.

[hider=Appearance] Marcus is dark skinned, thin faced man, 5 feet 8 inches and 165 pounds. His hair is cut short, facial hair has been cut off, only some sideburns go down half an inch under the ears. Face is almost triangular and thin-lipped mouth is surrounded with noticeable cheekbones and sharp nose. His brown eyes, always alarmed are under thin eyebrows. His face is usually neutral, alarmed, inspecting surroundings.

He has a lean body and muscles to climb, run and dance around his opponents, but not strength to wield large weapons or armor. He wears long, dark leather jacket, red scarf, a bowler, long leather shoes and  brown gloves. Each garment is tainted with burn marks from his past life. There are satchels on his belt for his ammunition and equipment.
[/hider]

[hider=Biography]
Marcus was born in a lowly family. They were always poor and his siblings had a hard childhood, as their mother and father eased their own suffering with blood and odd jobs to get it. Kids were quickly thrown to the alleys and bad crowd, where they learned to become thieves and muggers. They ran in groups, hid from beasts and hunters alike and attacked whatever they left behind. 

At some point the gang got their hands on pistols, then molotov coctails and other flammable things. While their major tactic still was to make run for it, they were no longer defenseless; Few times they killed beasts by immobilizing them for a moment and burning them dead. Marcus enjoyed seeing them beasts in fire. It made him feel powerful, their screams of agony a testament to his victory. 

Things got worse five years ago, when the Hunt was at it's peak. Marcus lost many of his gang members to beasts and hunters alike, one of the latter killing his sister. Marcus couldn't help put watch as the man spliced Ella and continued finding prey. He spent last moments holding her with Ella weeping in pain, before she was gone. During following months he grieved and vowed revenge to the hunter who had killed sister. Stockpiling ammunition and molotov coctail, he returned to the old ways: He formed a gang himself and started smuggling, pilfering and mugging. With hope to gain enough resources and eyes to eventually track down his sister's killer.

Things had changed after the Night of the Hunt. New people, desperate to find salvation from blood were paying anything for blood that Marcus's gang pilfered and smuggled outside the city. But there were new gangs in town: The Fire Dancers. Marcus's gang was no match for these hunters that used their weapons and abilities to rob from both the healing church and Yharnamites. During the years the Fire Dancers surprised Marcus's gang few times, each ending up with Marcus's gang losing their members. He was, regrettably, left no other choose but to run from these assailants, hence he was known as the Rat.

While there were good times for the gang, last encounter with Fire Dancers left gang with handful of members. Whoever was left decided to move on and the gang disbanded. What resources the gang had left was split between the final members. Marcus had seen the power of the Hunters  many times and he had finally the epiphany: To defeat the hunter he had to become one. Hence he went to meet the Black Healing Church. After inspecting his body they offered him a special treatment to become hunter unlike any other. 

Marcus said yes. [/hider]

[b][u]Skills:[/u][/b] Marcus is a good shot and experienced fighter due to background in gang life. His throwing arm is good, which helps when he needs to use Molotov Coctails.

[b][u]Abilities:[/u][/b] Marcus is agile and enduring enough to have successfully ran away from hunters a few times. His strength is moderate and his vitality allows him to go on against moderate wounds, but he prefers dodging the assailant's slashes. 


[/hider]