Blood manipulation is freaking op
If you can control any type of blood you can literally chibaku tensei someone because there is a bunch of blood in the ground so you can raise it up and possibly bring some of the ground up or you can cut someone and manipulate their blood to come out and they die of blood loss
Even better you can harden the blood and cut someone's neck off or even make a shield out of blood
There is so many options its just so good and we not even talking about the super natural body bit either