This question is really difficult!
33. favorite BL manga seme/uke (can be from different series)
Would it be cheating if I said just Iwaki? It's perfect for this question since he is both, seme and uke. :)
Well, I kind of like tsundere ukes with glasses, like Yuki from Kare ja nai Kedo, but Iwaki from Haru wo Daiteita is my favourite uke: mature, beautiful but masculine at the same time, just perfect.
As for semes, I can only choose one? It's really difficult, I like semes like Chiga from Seito Kaichou and I already said that I like tough guys with seductive eyes and smile (if you ever see it) like Asami from Viewfinder, Mookyul would be good too. But I also like guys like Togawa from Doushitemo Furetalunai. This question is driving me crazy! I think I will go for the serious seme, caring and that knows exactly what he wants (and he doesn't force the uke to do anything he doesn't want to do), a tiny little bit childish and with just a pinch of possessiveness: Kazumi from Signal Red Baby by Kitakami Ren.
Useless semes are not my cup of tea, even if they are funny, I usually find them annoying.
(Iwaki is the one on the right side and Kazumi the one on the left)