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.
There are many novels related to Plants vs Zombies! For example,"The Legend of the Botanic Card Creator","The Botanic Mountain Monarch","The Great Botanic Overlord","Overlord: I Summon Plants vs. Zombies in the Abyss","Where Are the Magical Plants?" Doomsday Plant Lord, Super Plant Zombie System, Family Cultivation: Starting with Plants vs Zombies, I Plant Zombies in the Other World, Playing Plants vs Zombies in the Full-time Mage World, I Cultivate in the Movies, Master Plants, Planting Herbs in the Underworld, and so on. I hope you like this fairy's recommendation. Muah ~😗
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.