material-d
One of the antagonists of Mahou Shoujo Lyrical Nanoha A's Portable: The Battle of Aces. Material-D, also known as Ruler of Darkness (闇統べる王 Yamisuberu Ō) and Lord Dearche (ロード・ディアーチェ Rōdo Diāche) is a "dark copy" of Yagami Hayate. She wields Yersiniakreuz, a copy of Hayate's Schwertkreuz, and the Tome of the Purple Sky, a copy of Hayate's Tome of the Night Sky.
In Mahou Shoujo Lyrical Nanoha INNOCENT, she is known as Dearche Kings Claudia and her resemblance to Hayate is merely coincidental.