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Overbearing pride. He's done a lot. He's seen a lot. He has a lot of experience. He's very accomplished, and he thinks anyone would benefit from learning from him. The "nostalgia" and "being over...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/20115 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20115 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Overbearing pride. He's done a lot. He's seen a lot. He has a lot of experience. He's very accomplished, and he thinks anyone would benefit from learning from him. The "nostalgia" and "being overlooked" you mentioned are the keys. He loved being helpful, loved being the strong protector, loved being the one everyone came to, loved the _attention._ It was for good reasons, but still. He enjoyed the spotlight, and now he doesn't have it any more. Maybe he wants to teach the reluctant hero because he wants the hero's praise and adulation. He may genuinely have a lot to offer, but he's being a jerk about offering it because he's honestly a little desperate for the old days when everyone admired him. He is very proud of what he did back in the day, and he wants everyone to remember it. It's not that his accomplishments are petty, because they are significant, but they were a while ago. So he feels like he has to remind everyone of what he did, often, and he's hoping to be asked to teach so he can be useful and admired again.