Less an AU in it's own right, more his specific kind of vampire, however it ends up coming up.
Sync's version of vampire is not contagious due to his unique situation of being a replica at the same time, causing his own blood to dissolve when not in contact with him, making him unable to share it. As a vampire, his already high natural speed and strength are boosted to insane levels. He's not stronger defensive wise, but he makes up for that with a high regeneration ability. Only powers deliberately made to hurt a vampire will damage him and make him unable to regenerate off the wounds. Sunlight doesn't burn him, but he prefers nighttime.
His bite is the kind that feels entirely too good to whoever he bites, and will only hurt if he wills it to. He feeds like any vampire does, and needs to every few days or risk losing control of himself to bloodlust. It's generally a good idea for him to feed, and provided he's not fighting it for some reason, it also tends to make him feel as good as it feels for whoever he's biting. Sync also has the ability to feed off and retain the blood of other replicas, making him one of the few that can actually sustain himself on them, as to any other the blood will simply dissolve once out of contact with its owner.
Sync's eyes will always glow faintly, at their dimmest only noticeable in very low light. The glow will strengthen when he wills it to, or if he's starting to lose control from lack of feeding. As the glow strengthens, so does the hypnotic effect that it imparts on those that see it. It's at its strongest when the glow is brightest and Sync is directly looking at a person. It's not complete mind control, but it can be very hard to resist. They also grant him total night vision, lack of light never being a problem for him.
Vampire
Sync's version of vampire is not contagious due to his unique situation of being a replica at the same time, causing his own blood to dissolve when not in contact with him, making him unable to share it. As a vampire, his already high natural speed and strength are boosted to insane levels. He's not stronger defensive wise, but he makes up for that with a high regeneration ability. Only powers deliberately made to hurt a vampire will damage him and make him unable to regenerate off the wounds. Sunlight doesn't burn him, but he prefers nighttime.
His bite is the kind that feels entirely too good to whoever he bites, and will only hurt if he wills it to. He feeds like any vampire does, and needs to every few days or risk losing control of himself to bloodlust. It's generally a good idea for him to feed, and provided he's not fighting it for some reason, it also tends to make him feel as good as it feels for whoever he's biting. Sync also has the ability to feed off and retain the blood of other replicas, making him one of the few that can actually sustain himself on them, as to any other the blood will simply dissolve once out of contact with its owner.
Sync's eyes will always glow faintly, at their dimmest only noticeable in very low light. The glow will strengthen when he wills it to, or if he's starting to lose control from lack of feeding. As the glow strengthens, so does the hypnotic effect that it imparts on those that see it. It's at its strongest when the glow is brightest and Sync is directly looking at a person. It's not complete mind control, but it can be very hard to resist. They also grant him total night vision, lack of light never being a problem for him.