Nezuko Kamado is a major character in the popular anime and manga series Demon Slayer: Kimetsu no Yaiba. She is the younger sister of the main protagonist, Tanjiro Kamado, and was turned into a demon at the beginning of the series after surviving an attack that killed the rest of her family.

Season 2 of Demon Slayer: Kimetsu no Yaiba has not yet been released, as of my knowledge cutoff in September 2021. However, based on the events of the first season and the information available from the manga, I can provide some context on Nezuko’s age and character development.
At the beginning of the series, Nezuko is portrayed as a young girl, likely around 12-13 years old. Her age is never explicitly stated, but she is shown to be physically smaller and less developed than her brother, who is 15 years old.
After being turned into a demon, Nezuko’s appearance changes significantly. She gains sharper fangs and claws, red eyes, and a distinctive scar on her forehead. She also becomes significantly stronger and faster than she was as a human, and gains the ability to regenerate from injuries.
Despite these changes, Nezuko’s personality remains largely unchanged. She is shown to be kind, compassionate, and fiercely protective of her brother. She also displays a strong willpower and a refusal to give into her demonic urges, which sets her apart from many of the other demons in the series.
As the series progresses, Nezuko’s age becomes less relevant to her character development. Instead, her experiences as a demon and her relationships with other characters shape her personality and worldview.
One significant relationship for Nezuko is with her brother, Tanjiro. Their bond is a central theme of the series, and their mutual love and devotion is a driving force behind much of the action. Despite being separated for much of the series, they continue to support each other and work towards a common goal of defeating the demon responsible for their family’s deaths.
Nezuko also forms relationships with other characters throughout the series, both human and demon. She is shown to have a strong sense of empathy and is often able to understand the emotions and motivations of those around her. This allows her to form connections even with those who would normally be considered her enemies.
In terms of her age in season 2, it’s unclear at this time exactly when the events of the season will take place. The manga, which the anime is based on, spans several years of time and features multiple story arcs. However, it’s likely that Nezuko will still be a young girl, as her physical appearance has not changed significantly since the beginning of the series.
Overall, Nezuko is a complex and beloved character in the world of anime and manga. Her age is only a small part of her identity, and her experiences as a demon and relationships with other characters are what make her such a compelling figure. As the series continues, it will be interesting to see how Nezuko’s character develops and what challenges she will face in the future.