What do you think is the best quality of Twilight Sparkle?

2398984 How she can absorb knowledge like a sponge. Take for instance how she used dark magic not by study, but by just watching Celestia perform it.

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2398984 That certainly is conveninet.
On that note, I like how she could handle it, but let go and go back to her jolly self and her friends.
Just as I like how she got back to herself, from what happened during Twilight Kingdom.
Although, another thing about her is how she did choose to stick to her friends after the first mission of reforming Nightmare Moon.

2398984 Her adorkableness of course. She's an egghead, but she's so cute, most of the time.