Avatar: Aang's Twin

Tang, an ordinary young man from modern-day Earth, dies while saving his friends and wakes up in the world of Avatar: The Last Airbender as Aang’s twin brother. Unlike Aang, he has no bending abilities and struggles to find his place. When he discovers a special ability called the Proficiency System, Tang decides to train and gain skills to protect his brother and prepare for the Fire Nation's attack. Using his unique power and modern knowledge, Tang becomes a valuable ally, proving that even without bending, he can change the course of the world’s destiny.