This topic came up on cosplay.com...

[ohariko.livejournal.com]

[Poll #1187121]
I'm interested in to see what your guys opinion is because the way I look at it, Lulu's hair is black and nothing more but some morons on cosplay.com thinks it's dark brown: http://www.cosplay.com/showthread.php?t=147188 .The nice easy way for me to remember it is that Lulu is black, Suzaku's hair is brown. Simple, ne? What's your opinion?

Comments

[sevthebat.livejournal.com]

Exactly. They ought to open up all the images of black-haired anime characters in a color picker some time.

As an aspiring artist who has actually been paid to do cel-shading on a per-hour basis (i.e., as a job, not a one-off commission), I'm telling you that it would be impossible with CG's art style for Lelouch to have pure black hair and not look ridiculous. The black might not actually be there, but it's implied.