I personally love Siegbert because of all the hilarious drawings people make about him on twitter since I find the way he tries so hard to be pretty endearing. Other favorites are Kiragi, Sophie, Mitama, Shiro, Forrest and Shigure.
On the other hand I found the Awakening look-alikes to be pretty uninteresting (minus Rhajat, liked in most of her supports). Not that I don't care about them, since I'm pretty lax and like most characters with ease but they are kind of low in my list. I was specially curious about Caeldori before the game came out because Cordelia is one of my favorite units in Awakening and a character dear to me but her expy didn't spark my interest this time around.