Hiro is becoming a RoyalAs his servitiude to Hime continues, he's able to access his "other side" with more self-control and for longer periods. Basically this involves increased strength and agility with Red Eyes with Hellish Pupils. Exactly the same traits Hime herself has. We've seen other Blood Immortals; but they haven't shown the same multiplication of strength that Hiro has.
The Paperbag man of Akasabi Village survived being killed by Hime.Severely weakened, he had to take lesser souls to survive, but he was permanently destroyed by Maka. She refers to him as Sonson J, the killer of Emerald Lake."
Kenny is a Royal's servant
Sawawa has experience serving monstersThat's the real reason of her Weirdness Censor...she is just used to a lot of those things. In fact, she perfectly aware 90% the people in the mansion aren't humans, it's just that nobody asked her if she knows that...she is probably unaware of the "Royal Family" and the whole battle thing, though.