Relationships
In The Art of Discworld, Pratchett describes Susan as "rather chilly", and Susan herself admits in Thief of Time that she finds it difficult to relate to other humans on a personal level because the supernatural parts of her mind tend to view mortal creatures as nothing more than "a temporary collection of atoms that not be around in another few decades". She has yet to demonstrate much affection for others, though her relationship with her grandfather, once strained, improves over the course of the series. Despite this, she finds herself unable to trust him completely because of the way he occasionally manipulates her into helping him.
Read more about this topic: Susan Sto Helit