Starhawk is fantastic.

• A 2-cost ally, which is already good - can attack/thwart and then block
• Can repeatedly thwart, at a ratio of 2 resources to 3 thwart over two turns, which is above rate in general, but especially helpful in Protection which is weak at thwarting
• Can go combo mode and attack for 2 and thwart for 1 every turn, which isn't necessarily amazing if you are paying 2 resources/turn for it, but is decently spicy if you're paying for it with cost reducers (e.g. Team-Building Exercise)
• Another combo option is to have him attack into enemies with Retaliate, allowing you to immediately repeat as much as you can pay for. Not very efficient, but for Protection, sometimes you have hands where you just want to be able to do something with your cards.
• gets more efficient if you can apply static buffs (e.g. Boot Camp, Team Training) in a multi-aspect deck or with help from a teammate