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 is ethnically Jewish but spiritually agnostic. Gert is known for her sarcastic one-liners, a pair of glasses, and brown dyed purple hair. She stands at a rough height of 5'1" and weighs 125 lb (57 kg).
In 2008, Marvel.com named Gert's death as the sixth out of ten best deaths in Marvel Comics history.
Read more about Gertrude Yorkes: Relationship With Other Runaways, Powers and Abilities, Conceptual Origins