Quoted from Pinzzz:The "Librarian" is Tim's (owner) wife.
It is hard too tell them apart.They both look alike.The difference is Tim wears glasses and his wife doesn't.
Charlotte doesn't really work on the games, I am pretty sure you are talking about Beth who has taken over some of the daily maintenance of machines.
Bit rude for people to say they look alike as other than the long grayish hair and both being slim I don't see it at all.