To clarify, the new character seems to use the pronouns: we/our/ourselves/us
"We're what wakes them up screaming."
"We picked up on your little crisis..."
"...our less puissant elders"
"...we're sure provide you..."
"We don't normally involve ourselves..."
"...we have a bit of a sentimental streak..."
"...what we are offering:"
"We'll poke around..."
"...we'll crack it..."
"...we'll remove it."
"We're afraid you'll have to..."
"We really don't think you will."
"We require your presence"
"...were were going to go rooting..."
"Gives us the shivers..."
"...we'll have Ms. Azuma do it."
"We daresay..."
"...consent to us cracking..."
"Darling, we think you know what we are. And we never lie."
"You have our word."
"...our personal satisfaction..."
"Do tell us if you start to go insane."
"Unless we got particular pleasure..."
Others refer to them with the pronouns: they
"They seem nice"
"If they wished to do me harm, they would have done so already."
My best guest is that their third person pronouns would be they/them:
http://pronoun.is/theyTheir first person pronouns would be we/us:
http://pronoun.is/we/us/our/ours/ourselves