Good question! I personally would opt for the character of Thresh. Let us remember what he does when he meets Clove and Katniss when the remaining contenders have to pick up the items that they need from the cornucopia. He kills Clove for what she said about Rue, but then spares Katniss because of her loyalty to Rue and her act of commemorating her life:
Conflicting emotions cross Thresh's face. He lowers the rock and points at me, almost accusingly. "Just this one time, I let you go. For the little girl. You and me, we're even then. No more owed. You understand?"
Thresh displays a concept of honour and loyalty to his district and to Rue that is displayed through letting Katniss go at this stage in the game. He recognises that he, as a representative of his District, owes Katniss something for what she did to Rue, and as a result, shows a higher level of honour than is displayed by any other of the characters.
I would think of Katniss because she gives her life to save others.