If one were to ask Vitaly about his childhood, he would sadly inform them that he doesn't remember anymore. He knew he had parents, of course, and he thought one of them was a Flareon. There may have been a sibling, too. However, this was all he can recall, and his first "real" memories were of hell. He recalled getting snatched by humans, perhaps for his strange coat, and being placed for sell to the highest bidder. As an Eevee, his coat was black, and he had strange green eyes. He didn't look like a fighter, so he was to be sold as a pet.
The first woman he was sold to tried to make it clear that he belonged to her now. Not as a friend, but as property. She tried to break his spirit through beatings, holding back food, and a collar that was on the edge of being too tight. Vitaly did not take kindly to this treatment, but he put up with her harsh treatment for a time. He was waiting for an opportunity, and the woman didn't realize that the tiny black Eevee she had purchased was plotting her death. She thought he was too small and stupid to even entertain such thoughts, and she dearly paid for her assumption. One of the people she lived with walked in to find her throat was ripped open, and the only thing in the room was the Eevee on a leash. He didn't have any blood on him, but there was no denying the hatred in his gaze. The police couldn't pin it on the Eevee either, for there was nothing to implicate such a small creature. Remembering where the owner got the Eevee, the person the woman lived with immediately sent a complaint saying that the Eevee had murdered her. They wanted to get rid of him, and they were too scared to try doing it themselves.
People came to take him away, and this time, they didn't put him on sale as a pet. If he managed to kill a human with such ferocity and not get caught, then there was a place that would be perfect for him. A Pokemon fighting ring where fights often went until one of the fighters died. Another woman, named Eva, looked at the dark Eevee, and decided to purchase him. His dark coat would make it hard for others to notice him, and he was at a discount since he was so small in comparison to the things usually seen in this ring. However, given the story he had behind him, she was much more careful in keeping him locked up, and worked even harder to make sure he was a good, obedient Pokemon. She did this through even harsher treatment, and eventually, the young Eevee couldn't even remember "home." However, despite this, he refused to bend to her will completely, and he once again played the waiting game. He stopped being openly defiant, and he simply kept watch for either an opportunity to kill her or a chance to run.
When he was first thrown in to the fighting ring, it was expected he would die. He was small, and Eevee weren't really known for being strong fighters. The odds were so against him, that when his owner put money on him, she was laughed at. One intense fight and a dead Zoroark later, she was laughing while she rechained the bloodied Eevee. That fight earned her a fair amount of money, and she was very much pleased by it. He wasn't really even phased at the killing; he wanted to get away. He couldn't get away if he was dead, so if he had to kill to survive, he would do it in a heartbeat.
At first it was almost a joke, the small Eevee slaughtering his opponents, but soon it turned into a legitimate attraction. People were utterly fascinated at how he could take down much larger Pokemon. Eva made sure he was never completely in over his head and gave him extremely powerful moves to fight with, and the Eevee continued to win and survive. He was eventually named, "Anisim," since he was useful enough to earn a name. He really didn't like the name, but he responded to it because he had to. It was also better than continuing being nameless.
This lifestyle continued for years, with Anisim always on guard for a chance to escape, and Eva also on guard around the Eevee. The standstill was finally broken when the Police broke up the ring while Anisim was fighting. Eva tried to grab him to run, but he slipped out of her grip. He used the chaos to sneak out of the dark building, and was almost stunned to see the sun again. He had been so used to being in darkness, that the light hurt his eyes for a few seconds. However, he didn't stay stunned long, and he ran into the alleyways of the town.
As the sun set, he happened to run into a priest outside of a church, and the priest took pity on the bedraggled Eevee. He gave Anisim some food, and offered to let him stay inside the church to rest. Anisim accepted it, for he didn't want to have to sleep outside that night, but after the priest had gone to sleep, Anisim suddenly got paranoid about the man's intentions. What if he only wanted to keep Anisim? or sell him again? These thoughts incensed him, and he thought about killing the man before running again. After careful thought, he decided it would be too much trouble, so he took some food and ran.
He didn't count on one of the neighbors being a police officer, and their pokemon keeping an eye on the neighborhood that night. The Oreon saw him sneak out with the packet of food, and hunted him down. Since the steel type resisted most of his attacks, and he was far too tired and injured to fight, they were able to drag him back to town with ease. The Oreon was about to take him to the police station, but the priest found the pair and vouched for the Eevee. Anisim was stunned. How could this man that he very obviously took from not want to punish him for his transgressions? This allowed the priest to pick him up from where the Oreon reluctantly dropped him, and he carried him back to the church. There the priest treated his wounds, and the ministrations were so gentle, Anisim shattered. For the first time in years, he started crying, and the priest comforted him. Which made the Eevee cry more. He hadn't known mercy and kindness for a long time.
While he healed, the priest would continue his duties, but he always made time for the Eevee. He would read to him, make sure his bandages were changed, and would give him plenty of food to eat. He even got someone to come and remove the much hated iron collar on the Eevee's neck. There was nasty scarring left from it, but the Eevee didn't care anymore.
Eventually, the Eevee was completely healed, and the priest gave him a choice. He could stay with him, or he could go free. Since he could no longer remember what home was before being taken, and living with the priest had been more like home than anything else, he decided to stay with him. To commemorate the staying, the priest gave him a new name, Boone Vitaly. The name roughly translated to Gift of Life, and when that was explained to the newly christened Eevee, he was again overcome with emotion. He also finally got a name to put to the priest, Father Myriel. Since Vitaly was ashamed of the scars on his throat, Myriel offered him a collar with a Soothe Bell on it, if he wanted to wear it. He accepted the gift, and Myriel made sure the collar wasn't too tight.
Vitaly still had the move Baby-Doll Eyes, so after several battles where he had to knock out an overly scared or aggressive Pokemon, he started evolving. His love for the priest and the fairy move evolved him into a Sylveon. He was slightly startled about his new form; he had a lot of white on his body now, and he was much bigger. The ribbons were also strange, and he had to learn how to use them. They were almost like having human hands, though, and he appreciated having them after a while. Life was fairly good; he learned how to help Father Myriel comfort various people and Pokemon. Eventually, Myriel replaced his fairy move for the move Heal Bell so that he could help with easing other Pokemon's pain.
The only thing that dampened his life was the Oreon that still lived nearby. Terjon remembered having to hunt Vitaly down, and he didn't miss how savage the Eevee was. Not believing the miraculous change in personality, Terjon kept an eye on Vitaly, and would occasionally warn other Pokemon away from him. It didn't help that occasionally, Vitaly would break into people's houses to leave money or food for them. Terjon never saw what he was doing, and he always assumed he was sneaking around for nefarious purposes. Despite trying several times to catch him, Terjon was never successful, and he mostly kept his eyes open for a potential attack that would never come.
Seven years of peace and the closest companionship Vitaly had ever known crashed down when the Epidemic hit. There was an order in town for all Pokemon to either be released or killed. Father Myriel refused to give Vitaly up to the military, and they decided to drag the old man away. Unfortunately, he was delicate with his old age, and they were far too rough with him. Vitaly saw his human crumble to the ground, and he was heartbroken. The sadness turned to sheer anger, and the fearful beast he had been almost raged to the forefront of his mind. He wanted to kill them so much, but he knew Father Myriel wouldn't have wanted that. So he stayed hidden until the men were gone, and he wept over Myriel's body. He stayed for a long time until he heard a sound in the bushes. He turned to look, but all he saw was something running away. He tried to fight anything that got too close to his precious human's body, but eventually, a horde of undead attacked, and he couldn't handle so many at once.
Regretting that he couldn't protect Myriel, he wept when he was finally a safe distance away, For the first time in his life, he had to consider if living was worth it. He had fought to live for so long that it was almost second nature to him, but losing so much pained him. Knowing love and then losing it had turned him hard and spiteful, and he didn't want to go that route again. He eventually came to the conclusion that there were other pokemon and humans out in the cruel world who needed help, and he should at least try to help them. Vowing to aid others in Father Myriel's memory, he set off to survive the Epidemic.
He doesn't always have a lot to say, and he won't force conversation.
-Prefers to stay in the shadows
Old habits die hard, and with the Epidemic, this came back with a vengeance. He doesn't walk openly and tends to stalk around in the dark. He feels safer in darkness since he is able to sneak away.
It's his new mission in life to help anyone he can in the Epidemic. Generally this is limited to those willing to let him, though with some of the more broken people he's encountered, he can be extremely stubborn about helping them.
He knows his past is tainted, and that he was not a good person before Myriel sparing him. Therefore he will extend the same kindness Myriel gave him to someone who appears truly repentant, and sometimes to those who don't deserve it.
A caveat to this is that those who try to take advantage of this too much will find his wrath fierce and deadly
It's really hard to push his buttons, and he if he's determined to help you, god dang it, he will. He is also an expert at playing waiting games with... less than savory sorts. If he finds himself in a situation where he cannot outright deal with a person or Pokemon, he will wait for an opportunity to strike
-A little awkward
Other than Myriel, he never got really close to others, and he couldn't exactly communicate with his human. So his ability to have close friends is slightly hindered.
He won't bring up his time in the fighting ring unless he absolutely has to. He might vaguely reference being stolen away from his family, but that's about as much as he'll say. He's afraid that if people know that he killed his first owner, and countless other Pokemon, then they'll despise him.
It's almost impossible to break him through force. While he was younger, this was due to sheer spite, but now it's his determination to not let the world turn him evil again.
Those having bad days/lives will find him a comforting presence. He'll try to help them, even if it's just listening to what they need to say.
-Defaults to following, but will lead if he has to
He's mostly used to just taking care of himself, so if he's in a group, he'll listen to what the apparent leader says. However, he is capable of taking the lead if he has to.
He feels immense amounts of guilt over how callously he killed Pokemon in the ring. What if they were just in the same boat as he was? This has not, does not, and will not ever apply to killing his first owner, however.
Fiercely. He will stick by the ones he tries to help. If someone manages to befriend him, then you can bet he will stand by them through almost anything.
Despite all of his good qualities, he is still a deadly fighter, and if he has to kill, he will.