The same STRIKE WITCHES OVA cast revealed earlier in the quote above later showed up on
Web Newtype Hot News (08/10/06), with comments about their characters and the show after a postrecording session.
Chiba Saeko and Tanaka Rie play the two "older sisters," the strict, fiery "oneechan" teacher Sakamoto Mio (age 19) and the gentle, elegant "oneesama" commander Minna-Dietlinde Wilke (age 18), respectively.
From her description, Minna-Dietlinde Wilcke sounds a lot like many Tanaka Rie characters: Lacus Clyne in Gundam SEED (DESTINY), Mariel in Hanaukyou Meidotai (La Verite) / Hanaukyo Maid Team (La Verite), Mikihara Ren in Full Metal Panic? Fumoffu, Morganna (when she is being deceptively kind, loving and motherly, not when she is being really mean, nasty and evil) in .hack//SIGN, Commander Clodia Soult in the Blue Flow PC game, Queen Diana of Aquitaine in the Musketeer Rouge drama CDs, Princess Frolance Gemonina in the Rune Princess image album CD and video game, etc.