I love Senyuu so much that everything is my favorite...
but if I had to choose...(this is hard XD)
My favorite chapter... the one before the last one in the anime (I don't remember the number)... when Ross says Aba's name, it was so cute!
My favorite characters... Alba and Ros! (mostly Alba) But I love Elf too, he is just too amazing!
My favorite scene... hmmm this one is hard... there are so many... I think the whole scene when Alba is in jail with Elf XD
My favorite time Alba was arrested: the second one, when they meet Janua and Ros is poking his ribs XD
By the way, I laughed a lot at Rinchan's titanic theme insertion moment XD