right now i think that what Hank is bringing by being back on the team is that he's the man whose the most opposed to killing people. I'm very new to Hank so I don't really know much about the man. Most of my impression of him is through the Nadia Van Dyne Wasp comic, where he is more of a shadow than a character.
So far the three traits that i've noticed from him is 1. anger and isolation, as a reaction to his new condition 2. protective over Jan, and 3. I don't think he's a fighter. Really he started all this superhero buinsness off as a scientist. So unlike Clint and Steve, who are fighters, I think Hank is more hesitant to kill people.
I might be wrong though. Again, I've only had Hank for like 3 issues.