Something I find weirdly absent in a lot of regency or succession novels is a candidate's tolerance for paperwork. We love the big moments, the speeches and the battles, but I think the real test of a 'worthy king' is if they can handle the tedious, soul-crushing administrative side without losing sight of the people it affects. The monarch who sees subjects as just numbers on a tax scroll is a disaster waiting to happen. You need someone with the patience to understand systems, who delegates not because they're lazy, but because they're smart enough to know their own limits. Charisma is fine for rallying crowds, but I'd follow a quiet, competent administrator who actually fixes the roads over a flashy hero any day. My favorite examples are often the reluctant strategists, the ones dragged to the throne who treat it like a complex problem to be solved rather than a prize to be won.
That said, I'm probably in the minority. Most readers want that magnetic, almost overpowered presence. But for me, the crown feels most deserved when it's a burden accepted, not a power seized.