Thea Queen
Thea Dearden Queen, also known as Speedy, is a fictional character portrayed by Willa Holland on The CW television series "Arrow", created by Greg Berlanti, Marc Guggenheim, and Andrew Kreisberg. She is the maternal half-sister of series protagonist Oliver Queen / Green Arrow. Although an original creation to the series, she adopts elements from the DC Comics superhero Mia Dearden / Speedy, created by writer Kevin Smith and artist Phil Hester.

Holland was a main cast member on "Arrow" from its first season until its sixth, and also crossed over to the spin-off Arrowverse series "The Flash". Although Thea Queen is loosely inspired by the existing comics character Mia Dearden, a sidekick of Green Arrow, the idea of Green Arrow working alongside his archer half-sister was later incorporated back into the comics in the form of Emiko Queen.
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Willa Holland
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The CW
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Arrow
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Greg Berlanti
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Marc Guggenheim
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Andrew Kreisberg
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Oliver Queen / Green Arrow
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DC Comics
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Mia Dearden / Speedy
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Kevin Smith
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Phil Hester
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Arrowverse
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The Flash
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Emiko Queen
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Thea Queen
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