Okay so a while back I made a post about a potential DMC6/post-DMC5 scenario in which Dante, in having absorbed the Sparda (and thus the Force Edge + Amulet that were key to the split between worlds), ends up inadvertently making himself into a living Seal.
One thing that hasn't left my mind since then is the concept of Dante ending up extra "connected" to the world because of it. Or even just because he's Sparda's son, if you want to extend it, but it'd definitely go up post-DMC5 Sword Absorption ordeal.
When Sparda split the worlds, he sealed away his own power. In this scenario, I imagine thay in doing so, he ended up connected to the Human World in a way beyond what any human or demonic should've been, leaving to him getting a sort of...awareness of the going ons of the world. He helped shape the Human World into what it was by sealing it off from the Demon World, and so the Human World filters some information back to him.
It's a passive thing. He can't turn it off. He learns to ignore it for the most part, because he doesn't need or want a lot of the information that's suddenly pinging his brain and impacting his senses, but it never truly goes away, it just gets quieter. A lot of it is vague, senses of "something happened" or the occasional better-than-normal read of a human where he has a general idea of what they're feeling or desire because the world picks up on it and, due to their proximity, passes the information along. There are certain things that tend to register more often than others; natural disasters that result in hundreds or thousands of deaths almost always register to him, as do demon summonings/portals of certain magnitudes. It's not that the world is trying to notify him to get him to do anything, or because it considers him a protector or anything (the Human World has no feelings; it's an ambient, consciousless entity with no real thoughts or desires). It does it because the world registers when extreme events of "damage" occur and Sparda's connection to it means he occasionally picks up on what it experiences.
With Dante having absorbed the Sparda and thus the parts that helped split the worlds, he'd end up on the receiving end of all of this information. His experience might even be stronger, both due to the extra compatibility of being part human himself, and because the Seal being used to maintain the split between worlds is actively a part of himself, unlike the Force Edge which Sparda left on the other side of the barrier.
I imagine it would be incredibly overwhelming. Disturbing. Suddenly Dante's feeling and knowing all these things he has absolutely no reason to feel or know, and it's freaking him out. He wouldn't know why at first, either. I think he's have to start by realizing he'd made himself into a Seal, which would be an ordeal by itself, and then he'd have to go along a pretty long, pretty complicated train ride to arrive at the destination of "the weird, vague things that are suddenly pinging in my head for no discernible reason aren't just some sort of hallucinations but factual occurrences that I am now aware of due to my existence as a Seal who is suddenly receiving the world's general knowledge because I've made myself into a key part of its continuing existence."
Sparda had the benefit of years of lived experience and less going on at the time to help him deal with everything. He made the Seals (most of which Vergil destroyed raising the Temen-ni-gru, which is how Dante ends up as the last one), then got to live in the relatively Demon-free human world for a while without many issues. I headcanon that the barrier between worlds actually didn't need that much maintenance at first because the wound of the split was so deep it took a while before it could start to so much as attempt to heal, at which point Sparda had to step up his game and start instituting extra processes and putting in more of his own power to keep the worlds split. Thanks to this, Sparda could devote a lot of time to figuring things out. Plus there were way fewer humans doing things back then.
Dante though? Not only is he actively being drained by virtue of being the only remaining Seal- which again, is an active part of himself in the DSD unlike the Force Edge which Sparda left behind-, but demons are crossing over and causing issues, there are way more humans, and Dante's probably in a way worse spot mentally than Sparda was, even if he has a better support group now than he did in the past. Years of issues don't just dissolve because Vergil showed up.
So! What's the point of this?
....I don't know. Just fun to share an idea. And it's a very long way of saying "here's my justification for how Dante could be Even More OP (and unnerving to outsiders) for funsies." Connection to the world giving him extra awareness of what's going on. It's hard to get past him, because he just Knows Stuff even when he shouldn't. Even pre-DMC5, if we assume some residual connection between Sparda and the world has been passed on to Dante, it allows for that extra awareness throughout his life. Some of it is just the result of having enhanced senses thanks to the demon blood, but some of it is Definitely More.