Jaune Arc is not weak. Raised by bandits and all sorts of unsavory people, Jaune has no ambition of being a hero. Instead he decides to live happily and lazily with no purpose in life, until he decides to interfere with his past.
Harry Potter should not exist. He knew that since the moment he stared at people that should not be alive. Nothing makes sense, and he undergoes a journey to search for the answer he desperately needs.