Yukiko is forgettable but she's still to sweet to not date, so I feel bad. Naoto's was atrocious though, killed every bit of so called development she has up to that point. & Marie was just bitter and boring 24/7 so I'm going with her.
Couldn't stand Chie: loud, carnivorous, gets mad to quickly (especially over stupid s***), and too tomboyish (like my girls elegant and classy). So yeah she is my least favorite and the girl I try to avoid dating. All other girls in P4 are great (and Naoto when she acts like a actual real girl), except the Sun girls and Ai(when she is whiney) --- It all started with Yukiko and Mitsuru...now I am happy