There's no information available to me regarding the creator of 'chica pulp fiction'. It could be an indie creator, someone just starting out and trying to blend different concepts, or it could be a more established artist working on a new and different project that hasn't gained wide recognition yet.
I'm not entirely sure as 'chica pulp fiction' isn't a widely known specific term. It could potentially be a story or work that combines elements related to a 'chica' (a girl or young woman in Spanish) and the style of pulp fiction which is often known for its fast - paced, somewhat lurid storytelling. But without more context, it's hard to say exactly.
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.
Perhaps Chica was acting out of a sense of loyalty to someone. If the 'perv' had wronged a friend or someone she cared about, she could have been avenging them. Also, it could be that she was following some sort of internal moral code within the fanfic's universe that dictated such actions against immoral characters like the 'perv'.
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.