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Gertrude Yorkes (self-referred to as Arsenic), is a fictional character in the Marvel Comics award-winning series, Runaways. She was created by author Brian K. Vaughan & artist Adrian Alphona, and debuted in Runaways vol. 1 #1 with most of the other main characters. Like every member of the original Runaways, she is the daughter of evil villains with special abilities; in Gert's case, time-travellers. Gertrude, often called "Gert" for short, is often regarded as the most "book-smart" of the Runaways yet also the most sarcastic and cynical. She has socialist leanings and although ethnically Jewish, Gert is agnostic. Gert is bespectacled and somewhat overweight, contrary to the typical notion of superheroines appearing physically fit and conventionally beautiful, making Gert unique among the heroines of the Marvel universe. Gert is known for her sarcastic one-liners, a pair of glasses, and brown dyed purple hair.