So, my major point would be to inject some levity into the proceedings, else we bore everyone with all the seriousness.
Examples that come to mind:
- Hazou jokingly playing up how scary Keiko is. "Why is my sister so scary? And she summons huge armored monsters with claws longer than my arm! How fair is that?"
- When talking about how the exams are a cooperative event, he could point at where the Kage sit and point out no fights have broken out yet.(Are the Kage sitting in relative proximity? That's the impression I've gotten. Disregard otherwise.)
- This is pretty important in general when referencing our time as missing-nin, as the subject in general is pretty touchy for all the ninja involved. Stuff like "Simple life advice: Don't go to Snow Country without some warm clothes, even if you've just learned Sealing and thing you're a really clever bastard".
- The point is to establish a contrast, so Hazou should be somewhat facetious against Keiko's unrelenting seriousness.
I'd also add that Hazou should acknowledge that the world isn't easy to change, but that's not a reason to stop trying. And even if it crushes him, he'll keep getting back up until it works.
