Well putting together a top 5 in no particular order.
C.C. - Put through a trial in 14. Always been an interesting character.
Kallen - Obviously getting captured wasn't her greatest moment
. Still love her reactions to things and she is a good person.
Suzaku - Has continued to develop though has done things people would hate him for. Interested to see what the end result for him is.
Anya - Bringing her unit into what turned into "capture Lelouch's hat". Interesting girl with a past that needs to be delved into.
Xingke - A pretty good guy with great skills. Sad to see has serious health issues. Still well worth of support.