Tatiana Maslany gets my vote for the multiple roles she is able to handle as a clone in Orphan Black. Next season will be it's final.
Wish I could give you a fair answer but I don't watch much TV at all. Mainly movies is all. Sorry.
Lady Gaga in AMERICAN HORROR STORY.
It´s to hard for me to choice.
Catriona Balfe, hands down.