Stepping into the Demon Lord role is less about raw power for Rimuru and more about political landmines and broken systems. Sure, Jura Tempest Federation is a cozy, idealistic place, but now he's got to negotiate with ancient, scheming monsters like the 'Eight Star Demon Lords' who've seen civilizations rise and fall. They're not going to take a slime who was human a few years ago seriously unless he proves he's not just a flash in the pan. The Walpurgis Council is basically a supernatural UN Security Council where everyone has millennia-old grudges and hidden agendas. Rimuru's challenge is navigating that without getting his entire nation dragged into a war he didn't start.
Then there's the internal pressure. He's not just a leader; he's literally the core of his people's souls through the naming and evolution system. Every major decision risks the lives of Benimaru, Shion, and everyone else who sees him as a parent-god figure. That's a massive emotional weight. He has to balance being a benevolent, approachable boss with the ruthless, strategic mind needed to protect them from external threats like the Eastern Empire. One misstep in diplomacy could mean Veldora gets provoked or Milim throws a tantrum that flattens cities. The administrative nightmare alone, trying to run a growing nation of monsters, humans, and other races with different needs, would break a lesser character.
Honestly, his biggest hurdle might be his own nature. He often prefers the path of least conflict, using clever solutions and shared benefits. But the demon lord world sometimes respects only displays of overwhelming force or cruel cunning. Learning when to switch from diplomat to unstoppable force, like he did with Falmuth, without losing the core of who he is, is his central tension post-coronation.