Character is listed as Blackrose. And if we got that far, Blackrose appears in .hack//sign. If you include GIFT at least. edit: Welp, didn't pay attention to the title. Well I guess it is somewhat misleading, but I don't think it matters much. Also given how old this upload is anyways.
@Rewyn: .hack is a mess of interconnected stories, and we don't have tags for three quarters of them. Frankly, I think we should just tag / name them as .hack and leave it as that. Now, let's consider: * p.11 Ouka. p.13 Kite and ?, p.14 Mistral -> all are more connected to .hack//Legend of the Twilight then SIGN * http://dothack.wikia.com/wiki/SIGN -> doesn't even list BlackRose as a character * http://dothack.wikia.com/wiki/Legend_of_the_Twilight -> Twilight is about Rena but Rena uses a BlackRose character * http://dothack.wikia.com/wiki/BlackRose -> BlackRose appears in stuff we don't have tags in (video games). Sigh. I think Twilight fits just a shade better. But the best solution is just .hack without anything because this is the name of the game series she appeared in . see https://en.wikipedia.org/wiki/.hack_(video_game_series)