Ume 4-koma Megami Magazine
Ume Aoki doujin "RKGKMDK" from COMIC1☆5, under Apricot+ alias
Sayaka closeup as in Madoka Magica Online
Sayaka as a regular girl
Sayaka as a magical girl
Sayaka as a witch (Oktavia von Seckendorff)
According to the Puella Magi Production Note, Sayaka's sword is similar to Kyoko's spear in which the blade can break in linked pieces. It could be use to wrap an enemy with it.
According to the Guidebook, Sayaka's sword may be used as a dynamite projector.
Sayaka's revised fortissimo hairpin in Manga Time Kirara Magica volume 1.