(Also, have grabbed The Lunatic Cafe, The Killing Dance, Burnt Offerings, Blue Moon and Obsidian Butterfly. I MIGHT grab Narcissus In Chains, but it's not that important other than Jason's mindset at the start of the book.)
And Jason, where I normally play him from, would be coming from AFTER Burnt Offerings. Which...honestly, even with her help, things probably fucked him up for a bit afterward.
Wither decays, and eventually disintegrates, organic matter by touch—a power which is involuntary. With extended contact he would reduce almost anything—or anyone—organic to dust.
As a result of his power he is only able to wear clothing made of synthetic textiles. This power is even more difficult to deal with due to Kevin's self-styled interpretation that his ability wants him to use it. It has a "hunger", which gives Kevin a desire to use it, though this could just be a psychological aspect of his power.
He is also sometimes shown to see things in their decayed form, such as live pigeons appearing to be decayed through his eyes. He had the ability to put out fire with his bare hands in a few issues.
Thing is. Kevin was actually a really good and sweet kid. But then M-Day happened and...he...didn't lose his powers with so many others. And then he overheard some of his friends talking about how he was dangerous. (They meant to keep him close to help out, but he didn't hear that part.)
You’ll probably get a decent amount of Dracula in play because he’s close to Anita.