I love these prompts! I definitely appreciate your disclaimer that it's a tool for groups that have been playing together already for some time. That being said, I think it could be a terrific tool to incorporate into Session 0 to assist in the generation of those bonds from the very jump of play.
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I think this is how Daggerheart does it, yes. I think that is totally valuable too. The party knowing each other, at least partially, before the campaign starts is a classic trick to help getting the game going, so yes, it can be totally used for heroes that already know each other from stuff before the campaign!