For the ones in-game the only missing atm is Fubuki.
Edit: And for missing girls for each section (not counting other DDs class I don't know): 34 girls. In numbers and words list go like this: 2 Mutsuki, 4 Fubuki, 4 Ayanami, 2 Hatsuharu, 1 Shiratsuyu, 2 Asashio, 3 Kagerou, 11 Yuugumo and 5 Akizuki. Edit #2: I may have forgot Shimakaze.