Sometimes I think the whole 'Dark Harry' or 'Lord Potter' trend overshadows how satisfying it can be to just see him be smart. Like, canon Harry is plenty clever—he figured out the Half-Blood Prince's book and led Dumbledore's Army—but he often downplays it. Fics where he leans into that, especially in a non-evil way, hit a sweet spot.
One that stuck with me is 'Harry Potter and the Methods of Rationality'. It's polarizing, sure, but it's the definition of openly embracing intelligence. Harry here is a scientist at heart, questioning magical theory and deconstructing wizard culture. It can get lecture-y, but the core idea of a hyper-logical Harry applying the scientific method to magic is fascinating. It's less about power and more about knowledge as his primary weapon.
Another angle I enjoy is the 'academic' Harry. Stories where he actually cares about his N.E.W.T.s, becomes a researcher, or gets deeply into magical theory without being a prodigy. There's a quiet series, can't recall the title exactly, where he befriends Hermione earlier and they become study partners, pushing each other. His intelligence is shown through diligence and collaboration, not just raw genius. That feels more relatable, and it's a nice change from the usual political or combat-focused plots.