Twilight is admittedly one of the most versatile characters. And funnily enough it doesn't come up at expenses of having unique aspects, but rather because hiser specialitites (leader-like, task oriented, snarky yet also wacky when pushed) makes her rather dynamic to write of.
It's very easy for the specialities to quickly make a character very linear or archetypical, even though those same traits are often what makes them rather open ended in a lot of ways. It helps that Twilight starts being "the smart one", but ends up becoming "the SMART one" (as in, from a bookish character who just simply gives info and looks sciency, to one who can actually back up her book smarts with actual applications, cunning, analytical, rational in the definition of actually coming with lots of ideas and analysis, eventually being quite out of the box, sometimes straightforward and some other times quite tricky in her approaches.) In other words, she's arguably one of the hardest to predict in a good way, a character that keeps you in your toes rather than one you already know what to expect and feels too static.