Hmm... Favorite character? That would be a tie between Rin/Riki. The rest of the original LB! come close later.
For reasons related to spoilers I won't say why Rin/Riki, but the rest of the LB! cast didn't appeal so much to me.
I don't know what people see in Lolis, particularly Kud. She even got a sequel done. Kurugaya has been copied since Kanon AFAIK, and has been done again in Rewrite for what I can see. Mio... wasn't that appealing to me, but I did end up shedding some manly tears. Haruchin? The bad end surprised me, just because I was looking for the CGs, but wow, was that surprising; besides that she seemed rather normal and spoiled for me.
Who else... Komari. Komari is actually the most likable of the girls besides Rin if you ask me. She is the one that
The EX girls I've not played, but I read about Saya and she seems like a really likable character.
But yeah, my vote goes for Riki/Rin And the rest of the LB!, which really is what the story is all about.
Niker