#(also Hawks investigated the LOV extensively so like. it's not actually gonna be an asspull if he knows Toga's blood type)

[super-paper]

"Hawks can't donate blood to Himiko because they probably don't even have the same blood type. Hawks and Ochako have Type B blood-- If Toga was Type B, too, she wouldn't have needed to transform into Ochako in the first place for the transfusion."

Easily rectified by making Himiko's blood type AB+, the universal recipient. Would be fitting considering the nature of her quirk, no?