Bishop is a witch hunter and VC Warrior. Bonnie is a witch and her father is an evil jackass trying to take over and she knows she‘s the one that has to kill him.
Bishop and Bonnie are great together - once he realizes she‘s been tricking him a bit. He lets her be strong and do what she needs to do, even though it kills him to not protect her from everything. He‘s an alpha male, but a really smart one that respects what Bonnie is capable of.