Johnny? XD Yeah, he's secretly the Heart and Hevlaska's lovechild, which explains the immortality-
...it looks like he got bitten, so he's ultimately just another scientist with a slightly bigger role than the other ones. (Since Reever is still being badass, and god only knows what happened to Bak. Where is Bak, anyway?!)
On that note, I'd almost like to see Bak become an Exorcist. Almost.