Tanjiro's strength in the manga is significant. He acquires new powers and techniques, and overcomes numerous powerful foes with determination and strategy.
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.
Tanjiro is believed to be 18 by the manga's end. This age is a result of the events and time that has passed since the beginning of the story, showing his maturation and development.
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.
Tanjiro's fate in the manga is that he ultimately passed away. This event was a significant part of the story's development and had a profound impact on the other characters and the overall plot.