20. Davos Seaworth
Why is this smuggler-turned-noble so loyal to the deeply unlikeable Stannis Baratheon? Because Stannis is the guy responsible for the "turned." The Onion Knight's such a stand-up guy that he makes his continued allegiance to the man who killed his own brother with a shadow demon — and cost Davos' son his life — feel not like a quid pro quo, but just what any decent person would do.