Warden

Diplomat-verse Twilight is the castle warden. She's the de facto No. 3 in the ruling hierarchy, should Celestia (and Luna, though not many people know that) become unavailable, but is currently content acting as a secretary to the empress and making sure everything around the castle works as intended. As such, quite a few people have already tried to get to the princess through her, but she's not only law-abiding to a fault, but absolutely refuses to partake in any political ploys floating around court, sometimes literally covering her ears so as to not violate her personal ethics. The few times she still gets wind of them, she either stays out as far as she can or acts in the way that she believes is best for the empire. 
Many a criminal's sentence has already started with the words "Dear Princess Celestia..."
When she isn't doing anything else, she likes to spend her time locked up in the castle library so as to avoid the hustle and bustle of court life and the various agencies acting in it. Said agencies have mostly written her off as Celestia's pet, being either irrelevant or dangerous to the various schemes going on. The only one who doesn't seem to care is Pinkie, who likes to stop by for a nice cup of tea and some light theological debate.

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And since Twilight hates disorganization, there is now a Diplomat-verse folder:
siansaar.deviantart.com/galler…