Claire Augustus is a 24-year-old graduate student in library sciences interning at the Williston Library of Smif College. She was introduced in strip 2203, along with her fellow interns Emily and Gabby.
She is Clinton's sister - not that she's particularly fond of the fact. They are NOT twins. They seem to be close and supportive underneath the squabbling and teasing. Their parents are divorced.
Claire has an undergraduate degree, and her graduate studies are supervised by Dr. Amelia Borogrove.
Career and personalityEdit
Claire tends to be a bit high-strung about her internship at the library, and jumped to the conclusion that the inept way Marten showed them around the library was "some kind of weird hazing ritual." This may have been representative of a general tendency to jump to conclusions.
Claire makes a conscious effort not to judge others' actions. However, she can react strongly to infidelity due to the past emotional trauma her father's actions caused and possibly due to jealousy.
She is good at taking things in stride in other circumstances, though, for example meeting Marten's family and even his AnthroPC.
Claire really wants to be a librarian, giving Marten her reasons here. She likes books, too.
Claire has a spontaneous sense of humour and enjoys making puns based on things other people are saying and doing. She generally gets a poor response to her attempts. This clearly frustrates her as she often puts considerable effort into them. The only major character to laugh at her puns has been Emily Azuma and there is in-strip evidence that she didn't even understand the terminological reference Claire used to make the pun.
Sex and drugs and rock & rollEdit
Claire is attracted to men. However, she has no prior romantic experience. She told Emily that she's never been kissed before. She later told Marten that going out to dinner with him is her first date. As of Strip 2892 she is no longer a virgin.
Claire's character is the first known transgender character to appear in QC. Jeph revealed that he was nervous about revealing this fact, as he has wanted to include a trans character for years, but wanted to execute it properly.
Claire owns a car, and is the only other main character (besides Raven ) to have this fact confirmed in the comic. From the badge on the hatchback door, it is apparently a Mazda model. Its license plate number is 7YA-GH3 
A fan (Josh Bryant, aka "Su1c1deK1ng") noted on Twitter that Claire may be an unintentional copy of a character in Calvin and Hobbes.
Claire and Hannelore share a love of organization and might become friends. Based on strip 2800 we will soon see if her attraction to Marten will be reciprocated. Marten is aware of her gender history (as is Emily, though their friends are not), and is her supervisor at the library. It will be interesting to see Jacques explore (or have his characters explore) this relationship. Recently, Marten and Claire have kissed and told Hannelore and Tai about their relationship. Tai has then told everyone she knew on strip 2824
Marigold lives at an apartment whose street address is 14 Elm Grove Lane whilst Claire and her mother live at '221 Elm'. It is possible that this is the same street although this has yet to be confirmed.