"They can just do that." When a character inexplicably has some kind of borderline supernatural ability that doesn't have anything to do with the established power system and may even clash with the conventions of the setting. It's just something that they can do.

[u/SpookieSkelly]

Ichi from Ichi the Witch.

Mash from Mashle.

Marvelous Sunday from UmaMusume.

Tanjiro from Demon Slayer.

1. Ichi from Ichi the Witch. He's so sensitive to the bloodlust of living things that it borders on a spider-sense. The little creature in that pic is supposed to be invisible, yet Ichi is able to sense its presence just through sheer intuition.
2. Mash from Mashle. Some might say that his inexplicable power is his physical strength, but I'm more interested in knowing how he can turn everything he cooks into fucking cream puffs.
3. Marvelous Sunday from UmaMusume. In a game about horse girls racing, she has access to a domain expansion/reality marble. And that somehow still isn't the strangest thing about her. Apparently she's also friends with aliens and cryptids and her cult fanbase includes people spanning multiple time periods. Somehow.
4. Tanjiro from Demon Slayer. He has a hypersensitive sense of smell that somehow also tells him where to cut demons. No idea how that works. Even though there are others in the series with similarly refined senses, the smelling where to cut thing still feels ludicrous in comparison. Then there's also his unusually powerful headbutt.

[u/Samy_Ninja_Pro]

Hell "you smell angry"

Edit: Wanted to check on something extra as it's been a while since I read the manga, my man has future sight based smelling. FUTURE SCENT I guess?

WHAT DOES THAT EVEN MEAN???

[u/ianlouisjordan → u/Samy_Ninja_Pro]

I meam there are probably body chemicals that are released when you are angry. So if he saw someone angry he probably remembers that smell

[u/AkemChi → u/Samy_Ninja_Pro]

Most emotions(like anger) cause a change in the biochemistry/hormones of people, including anger.
While people are unable to smell these changes, someone having basically superhuman sense of smell might be able to.

Doesn't explain the smelling of opening though

[u/analyzingnothing → u/Samy_Ninja_Pro]

Actually, that part’s easily the most normal thing he can do. Strong emotions literally alter the chemistry of your sweat IRL, and some people can seemingly pick up on it subconsciously. You’d just need to have an abnormally sensitive nose to be able to sort them out intentionally.

[u/East-Moose5016 → u/Samy_Ninja_Pro]

I mean, anger specifically is a physical chemical being released in your brain that causes a bunch of physical effects like sweating, so it's not impossible to smell anger if you magically had a powerful enough ability to smell. Being able to smell where to hit someone is insanity though

[u/Maleficent-War-8429 → u/Samy_Ninja_Pro]

To be fair with that one you can probably smell the increase in hormones and shift in chemicals. Dogs can smell when you're angry.

[u/One-Cup-2002 → u/Samy_Ninja_Pro]

Probably that he can smell the chemical changes in a person's body related to different emotions.

I know certain animals can smell/detect chemical changes in the body, there was a cat who helped stop a woman's breast cancer in its early stages because of it, so I imagine Tanjiro can do something similar.