Sure, Tanjiro masters Sun Breathing in the manga. It's a turning point that showcases his determination and progress. It also ties into the broader story and his quest for justice.
Tanjiro might use his sense of smell to detect hidden threats. Since his sense of smell is super - enhanced, he could sniff out any demons or traps in the way of saving Rengoku. For example, if there are demons disguised as allies, Tanjiro would be able to tell by their scent.
Well, in some fanfictions, Naruto might learn the Flying Thunder God technique from Minato. He could use it by marking certain locations or objects with his chakra. Then, he can instantaneously teleport to those marked spots during battles, catching his enemies off - guard.
The Thunder Auction Series was a fantasy novel that had nothing to do with the player. Fantasy novels usually used words to describe the story instead of a player.
Well, Tanjiro's fate in the manga is tied to his determination to save others and the ultimate confrontation with powerful foes. His death comes as a poignant end to his heroic journey.