Hm, well, I don't have a set-in-stone 가장 좋아하는 but here are some of mine:
Takano and Ritsu from Sekai Ichi Hatsukoi Nezumi and Shion from No. 6 Nowaki and Hiroki from Junjou Romantica
I like 더 많이 than those three, however.
UPDATED (after a year...); Though I do still 사랑 all three of the above ones listed, I thought I might add a few 더 많이 to it;
Tohru Mutou and Natsuno Yuuki | Shiki (Current 가장 좋아하는 <3) Shun Aonuma and Satoru Asahina | Shinsekai Yori Kururugi Suzaku and Lelouch vi Britannia | Code Geass Kaworu Nagisa and Shinji Ikari | Neon Genesis Evangelion
And a great deal 더 많이 but for right now, these are my favorites.
My 가장 좋아하는 ship (out of many) would have to be Dave/John. They're from Homestuck. Although it's not canon, and I doubt it ever will be.. it is one of my otps
Can't choose one~ Ummm.... Nezumi and Sion from No. 6 All the couples from Sekaiichi Hatsukoi All the couples from Junjou Romantica Abe and Mihashi from Ookiku Furikabutte (even though they're not a real couple //sob) And a couple 더 많이 I can't remember, eheheheh...