Hannes was a very kind, good-natured man, but he always drank irresponsibly. Although somewhat cowardly, he was determined to die if it meant freeing Eren from his captors. He was greatly ashamed of his lack of courage five years ago, and waited to encounter the Titan  who killed Eren's mother, Carla Jaeger, again, in order to slay it and make up for his past mistakes. Hannes cares deeply for Eren and Mikasa and looked out for them after Carla was eaten.