No.
He didn't have that big of a role in the Lightning Thief. We do, however find out that he is the father of Thalia, a feisty girl who was turned into a tree at Camp Half-Blood.
NO!
NO!
It is a deadly poison.
actually there are 10!! the following are in no particular order... boils frogs water turned into blood vermin hail locusts darkness disease on livestock lice slaying of the first born
Blood that has turned into a hematoma.
0.30%
Yes
Blood cannot be turned off in Halo 3: ODST.
Yes and it can be very deadly
16
no, she was still mortal, but her blood was turned to acid.