Arrow Writers: Willa, it's so nice to meet you. Your character is one of the most exciting in Arrow. She is Thea Dearden Queen, AKA Speedy. She's a very loose take on Kevin Smith's Speedy, Mia Dearden, who was Green Arrow's sidekick.
Willa: Oh, wow, the hero's sidekick. That sounds awesome.
Arrow Writers: It does, doesn't it? Well, in this show she's a self-centered, bratty teenager who has nothing to do with the main plot unless she's kidnapped.
Willa: ...I thought...
Arrow Writers: Don't worry. We throw in hints about Speedy becoming Oliver's sidekick, with a bunch of archery trophies in your room and dialogue throughout the series about what a stellar aim you have.
Willa: OK, cool. Because for a minute...
Arrow Writers: As of now in our two season plan, none of that actually comes into play.
Willa: …
Arrow Writers: But no worries. We have great stories planned for you. Listen to this. When your brother comes home full of scars and PTSD after being stranded on a hellish island for five years, you're angry and bratty with him about “leaving” you alone. You somehow manage to turn his tragedy into yours. In true Speedy fashion, you have a drug addiction arc for a little while, getting pulled over for DUIs and such. None of this really amounts to anything except filler for Oliver to deal with. Doesn't that sound cool?
Willa: No... No, it doesn't. What's wrong with you?
Arrow Writers: You also fantasize about and kiss your brother.
Willa: I do what now?
Arrow Writers: Uh, you kiss your brother's friend. That's it. You kiss your brother's friend.
-later in the season-
Arrow Writers: Oh, Willa, by the way, you know that stuff about a sidekick? Well, we kinda figured that out. Thea becomes so important with it.
Willa: Yes! Here we go!
Arrow Writers: We introduce ANOTHER character, this guy named Roy who Thea starts to date. And Thea is used almost exclusively as a bridge to get him to be Oliver's sidekick. And then most of your stories from then on are all about Roy and your super interesting relationship with him. Your big moment in the finale is an in-show "Don't text and drive" ad.
Willa: ...oh my gooooooooooood.
-season 2-
Arrow Writers: OK, Willa, we got a lot of complaints about your character last season. We were shocked to find out that she was the least popular character in the whole show.
Willa: Who could have guessed that...
Arrow Writers: So we're going to make some big adjustments. It's a new day for Thea.
Willa: OK. Let's do this.
Arrow Writers: When season 2 starts, Thea is much more mature. She reconciles with her mother. She's cool with her brother. She's in an OK relationship. She works at her brother's bar. She becomes a positive side character.
Willa: Nice. It's no sidekick, but it's no “worst character on the show” either. I'll take it.
Arrow Writers: We have a big surprise too. Ready? In episode 7 we reveal that Thea is actually Malcolm Merlyn's daughter, and that Malcolm is still alive and wants a relationship with her!
Willa: Whoa! That could lead to some huge stuff.
Arrow Writers: Yup! And then for the next 11 episodes we barely do anything with it. You just deal with Roy relationship stuff.
Willa: ...
Arrow Writers: Then late in the season you go back to the self-centered, bratty Thea that everyone hates after she finds out she's Merlyn's kid. She starts talking about “her bar” to Oliver, even though it's Oliver's bar and he just lets her work there. She hates her mother again right up until she's killed by the villain. We also contrive it so that it ends up being Thea's fault that the Queen fortune is lost because, in classic bratty fashion, Thea refuses to sign a paper that would transfer the money to her and her family.
Willa: I am speechless... Just... What...
Arrow Writers: Not to brag, but we impress ourselves too sometimes.
Willa: So, uh, that Merlyn stuff. What are you going to do with that?
Arrow Writers: You'll find out soon enough. It's gonna be great!
Willa: Yeah... I bet...