Valli's godly grandparent was famed for being so beloved that all swore not to harm him, and while it only emerged as of late, Valli appears to have inherited that trait, even if his mother did not. Valli simply cannot be hurt, and reality tends to twist around to accommodate this fact. Bullets fired at him miss, even if the shooter is a trained marksman. Guns fired at point blank range tend to explode in strange ways that only hurt the person doing the firing. Just like his godly grandparent, Valli is almost effectively immortal, the world itself simply refusing to allow him to be harmed.
To those who can sense death, Valli would feel like the opposite of a reaper. He's not just alive, he's so alive he practically glows with life. Those who can see days and causes of death will find a whole lot of nothing when they look at Valli, even though he's not actually immortal.
Unfortunately, this doesn't apply at all to his greatest weakness: Mistletoe. If he's even in the same room as mistletoe he's liable to have trouble breathing and break into hives, but if he touches mistletoe it's a guaranteed trip to the hospital. He has an epipen in his desk year round, but carries one with him during the holidays. He's thankful that people have started resorting the plastic mistletoe decorations, because that means he doesn't have to avoid any holiday decorations.
