what if tanjiro was born with yoriichi's potential

Yes, in some fanfictions, Tanjiro is depicted as the reincarnation of Yoriichi. This concept adds an interesting layer to the story as Yoriichi was an extremely powerful and legendary figure in the original lore. The idea allows for new storylines where Tanjiro might inherit some of Yoriichi's skills or have a deeper connection to the past events related to Yoriichi.

One implication is that Tanjiro may have access to Yoriichi's combat skills. Yoriichi was a master swordsman, so Tanjiro could potentially inherit his swordsmanship techniques, making him even more formidable in battles against demons.

For Tanjiro, he could become more understanding of the complex nature of demons. Meeting Kokushibo, a powerful and complex demon, might make him realize that not all demons are simply evil. Kokushibo, on the other hand, could start to have some doubts about his loyalty to Muzan. Tanjiro's tenacity and belief in the good of all might start to chip away at Kokushibo's cold - hearted exterior.

One potential ability is a greater connection to nature. This could allow him to communicate with animals or plants in a way that normal ninjas can't. In battles, he could use this connection to his advantage, like getting animals to help him in combat or using plants as a form of defense. Also, his chakra reserves would likely be larger, enabling him to perform more powerful and continuous attacks without getting tired quickly.

Another potential character could be a dragon oracle. This oracle could have the ability to see Natsu's true nature and destiny. They could either help Natsu understand his powers and purpose or be a bit of a trickster, making Natsu's journey to discover himself even more difficult. And of course, the other members of Fairy Tail would be there to support or sometimes misunderstand Natsu as he deals with his dragon - born identity.

Well, aside from Percy himself, there could be a wise old owl as a mentor figure. The owl could teach Percy about the secrets of the wild, like which plants are safe to eat and which are poisonous. There might also be a wild horse that Percy befriends and rides. This horse could be his loyal companion during his adventures in the wild.

The villagers themselves could be antagonists in a way. Their fear of Naruto's 'demon' side might lead them to try and ostracize or even harm him.

Tanjiro's rank changes throughout the manga depending on the specific plot and challenges. It's not a straightforward fixed rank.

Tanjiro goes through a lot of challenges and battles. He keeps growing stronger and faces various demons to protect his loved ones.

The Hashiras would likely show concern. Some, like Shinobu, would immediately start looking into possible medical solutions. Giyuu might be more reserved in his worry but would still keep a close eye on Tanjiro. The other demon slayers would also be affected. They look up to Tanjiro, so his sickness would lower the morale of the group. They would try to support each other while waiting for Tanjiro to recover.