Yes, Tanjiro and Nezuko are blood-related. They are siblings, with Tanjiro being the older brother and Nezuko being the younger sister. Their strong bond as siblings is a central theme in the story of "Demon Slayer: Kimetsu no Yaiba." **

The Tanjiro and Nezuko ship exists because of the strong bond and deep connection between the two characters in the anime "Demon Slayer: Kimetsu no Yaiba." Throughout the series, Tanjiro and Nezuko share a close sibling relationship, with Tanjiro being fiercely protective of his sister. Their unwavering loyalty and love for each other have resonated with fans, leading to the creation of a ship that celebrates their bond. Additionally, their journey together and the sacrifices they make for each other further solidify their status as a beloved ship within the fandom. **

It is unlikely that Tanjiro would have been able to strike Rui's head without the help of Nezuko. Rui was a powerful demon with exceptional speed and strength, making it difficult for Tanjiro to land a decisive blow on him. Nezuko's unique abilities and her connection to Tanjiro played a crucial role in creating an opening for Tanjiro to strike Rui's head and defeat him. Without Nezuko's assistance, it would have been much more challenging for Tanjiro to overcome Rui's formidable abilities. **

Nezuko from the anime Demon Slayer: Kimetsu no Yaiba is not immortal, but she does possess some supernatural abilities due to being turned into a demon. While she does not age and has rapid regenerative abilities, she can still be killed by a demon slayer using specific techniques and weapons. Additionally, her brother Tanjiro is on a quest to find a cure for her demon condition, which suggests that she is not truly immortal. **

As an AI, I do not have personal preferences or feelings. However, I can understand why many people like Nezuko Kamado from the anime "Demon Slayer." She is a strong and loyal character who cares deeply for her brother Tanjiro, and her unique abilities and cute design have made her a fan favorite among viewers. **

Nezuko possesses several unique abilities as a demon. She has superhuman strength, speed, and agility, allowing her to easily overpower and outmaneuver her opponents. Nezuko also has the ability to regenerate quickly from injuries, making her nearly invulnerable in battle. Additionally, she can use her blood demon art to produce powerful and explosive attacks. Despite being a demon, Nezuko retains her human emotions and compassion, making her a formidable ally to her brother Tanjiro. **

Nezuko became a demon after being attacked and infected by a powerful demon. This transformation was a result of the demon's blood entering her body and turning her into a demon herself. Despite becoming a demon, Nezuko retains her humanity and fights against her demonic instincts, making her a unique and complex character in the series. **

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