Not gonna lie, I've loved Alan since the first time I saw him in Knight's Tale, but there is something about hiw as Wash in Firefly that is so sweet and funny and innocent that this has become his iconic role for me.
Dollhouse is an interesting show with a really cool concept that definately should have kept going, but even though it didn't I just loved Eliza in this role as Echo/Caroline. You can't help but root for her.
Last but not least is Doyle, the lovable half breed who gets visions of those in need from the Powers that Be. In the end he goes out with style and a kiss and a last little curse for Cordelia. Love it.