Any protagonist who is only debatably a "protagonist," like Jack Seward from Dracula or Heathcliff from Wuthering Heights. Both are not your typical "good guys," Heathcliff being more of a villain, but Jack tells a majority of the story and Heathcliff is the main character of his story. Since protagonist technically just means leading character, the character doesn't have to be a hero, though there's usually an implication that they aren't bad. Memorable protagonists to me are very human with all the flaws and messiness associated.

I think so, as the survivor and teller of the story, but I could see how he's not since he makes himself out to be a background character in the larger plot