I can't say anything about Shep because I don't know the canon though I'd love to play it, argh Bioware why so cool, but I will say that I am really enjoying her extremely tense relationship with the Spartans and she seems epically cool.

I DO know Dug, and I love him to itty bitty Golden Retriever-shaped pieces. He's so IC it's ridiculous and I want to keep him forever and ever.