Wonder / Travis Thrasher.

Enhanced descriptions from Syndetics:

As the town of Appleton is rocked by the death of a teenager, the high school year begins under a dark shadow. Brandon continues to pursue Marvel while trying to discover what she believes will happen to her. It's easy to fall more in love with her. It's easy to forget she thinks God told her she will have to sacrifice herself to save others. But Brandon can't forget about the shapeless evil that seems to watch him around corners and seep through the streets of his town. Strange things start to occur to Brandon. He starts looking for clues about the dead student, thinking this might be related to whatever evil Marvel is talking about. He also continues to battle against the guys picking on a nerdy senior named Seth Belcher. Marvel falls in love with Brandon, and he truly accepts her faith even though he doesn't understand what to make of it. Something is growing in the darkness. Something is coming. Will Brandon be able to stand up against the malice that draws ever closer? Will he be able to save Marvel from the horrors to come?