[Name] Gwendoline Mary Lacey [Nickname] Gwendoline, Gwen, Dear Gwendoline Mary [Appeared in Form] Forms 1–6 [Note] 
The spoilt one of the form, who always entertains the girls at the start of the term with a crying fit from her mum (Alicia copies her and sneers). Her surname in the first two books is given as "Lacey", but from the third book onwards the spelling is changed to "Lacy." She is described as thin and blonde in the first form, and in at the start of Upper Fourth as fat and spotty. In the first form she holds Mary-Lou under the water in the pool and is slapped by Darrell. She makes a huge fuss over it; she rubs cold cream into her legs and refuses to accept Darrell's apology. She also smashes Mary-Lou's pen and lets Darrell take the blame. She is shown to be incredibly superficial, sucking up to Daphne when she is new and believed to be well-off but later drops Daphne as a friend when it turns out she is a thief. In the next book she attempts to ingratiate herself with the Honourable Clarissa Carter and claims herself to have a weak heart but just alienates herself from Clarissa who truly does have a weak heart. Gwen is often in trouble with her father, who tries to support her but she continually angers him by getting into trouble; in the final book, he gets an illness which nearly kills him, and which is implied to have been caused by his inability to cope with Gwen's behaviour any longer. The emotional and financial repercussions of this tragedy see Gwen having to face the harsh realities of life when she is forced to leave Malory Towers and get a job to support her parents due to her father's inability to return to work. She makes up with Darrell before leaving, and the letter she sends her suggests that Gwen has started redeeming herself.