Board Thread:Questions and Answers/@comment-104.179.61.245-20150903014854/@comment-104.179.61.245-20150904135425

I found the reference to her hair color in the scene after Kirito wakes up after getting Asuna logged off in volume 4 Fairy Dance light novel translation. To quote:

--

I felt a deep sense of exhaustion when I opened my eyes. In front of my eyes was Suguha’s face and she was looking at my face with a worried expression. When our eyes met she hurriedly stood up.

“S-, sorry, I entered your room without permission. When you didn’t come back for a long while, I became worried...”

Suguha said, with her cheeks slightly flushed as she sat on the edge of my bed. After a little time lag my limbs regained a sense of connection and I forcefully push my upper body up.

“Sorry I was late.”

“...is it all over?”

“- Yeah... finished... everything...”

For a moment I stared into space while answering. Being in a dangerous situation in the virtual world and getting captured, but this time imprisoned without being able to be cleared, wasn’t something I could tell Suguha. Eventually I would tell her everything, but right now I don’t want her to be more worried. This one and only younger sister who had already saved me more times than words could tell.

That one late night in the forest, I met a green-haired girl and my new adventure started - during the whole long journey, she was always with me. She showed me the way, taught me about the scenery and protected me with her sword. If she hadn’t introduced me to the two lords and made friends with them, I definitely would not have been able to break through the wall of the guardian knights.

-

Given the context, the reference to "a green-haired girl" couldn't be anyone other than Leafa and the "two lords" that he was introduced to would have to be Alicia Rue and Sakuya.

Hence, the question about why Leafa is Blonde in the anime....