Considering that a thread for your first girl already exists, I think it's fair to have a counterpart related to the last girl you picked. The one that you either put off because you though that you'd hate, or because you actually disliked her. Or maybe you wanted to save her for last because you wanted to give the others a chance? Or maybe her route was the one that you had high expectations of, and one that you'd be sure would be worth the wait.
Anyways, my final route was Hanako's. My plan had been to save her's for last so I could give the other girls a chance, and I'm glad I did. I first discovered Hanako via YTPs called Micheal Rosen falls in Love and Micheal Rosen plays Katawa Shoujo. Later on, I'd meet a forum member (who turned out to be sockpuppet of someone who'd later become a friend of mine, but that's a long, complex story) elsewhere who had Hanako as her avatar and I ended up having a crush on her. Those factors along with Hanako's personality is what made me come to love her, and when the time came to play her route, I was so happy.
The route felt rather smooth, and while I do wish that I got to spend more time with Hanako herself, I did enjoy the time I got to spend with her. Her bad ending route made me feel anxiety and fear, and "Missteps" is the most painful scene to watch in the entire game, with me feeling anxiety, fear and rage on Hanako's behalf as my reactions alternate between "Hisao, please stop" and "Hisao, please stop making this about yourself". Despite my dislike for Lily's route, I did enjoy Hanako there and it was nice to see her becoming more independant by joining the newspaper club and planning to travel to Hokkaido, events which I still believe could happen after Hanako's good ending.