Alison O'Sullivan

Alison O'Sullivan is a major character in the St Clare's series. She is a student at St Clare's and first appears in The O'Sullivan Twins.

Backstory
Alison used to go to Redroofs School with Pat and Isabel O'Sullivan. She claims to have been good at hockey, but Pat does not remember Alison being good at any sport.

The O'Sullivan Twins
Alison joins as Pat and Isabel's stuck up cousin, left out of secrets for her habit of bleating. The top form girls Rita George and Katie White send for Alison to do their chores, but she accidentally burns Rita's French prep, incurring the wrath of Rita and Katie and the first formers. Alison discovers the truth of Margery Fenworthy's disgrace and exposes her secret to the first and second formers, after they suspect that she has been playing nasty tricks on Pat.