What is the Work?
The Legend of Korra is the sequel series to Avatar: The Last Airbender. It follows Aang's reincarnation Korra, as she continues Aang's legacy of bringing balance to the modern-day world.
Who are they?
Avatar Wan is is one of the two overarching protagonists (alongside Raava) of the Avatar: The Last Airbender franchise.
What Makes Him a Shonen Hero?
Heroic/Honorable: Wan confronts and eventually seals Vaatu, and devotes his life to maintain peace among Four Nations and the Spirit World.
Courageous/Reckless: Wan is not afraid of confronting enemies even the powerful Vaatu.
Stubborn: Wan refuses to give up fighting against the unsealed Vaatu despite being beaten by the latter, and willingly allows Raava to possess him despite knowing that he could die because of the possession.
Pursues a Big-End Goal: Wan has devoted his life to maintain peace among Four Nations and the Spirit World.
Hard-Working: Wan has trained himself to be capable of using different bending, and has been keeping peace among Four Nations and the Spirit World.
Optimistic: Wan is generally optimistic despite initially living in poverty, and his optimistic attitude allows him to become a capable peacekeeper.
Possesses Plot Armor: Wan would die because of being possessed by Raava if he did not prenatally fuse with Raava thanks to the spirit portal during the Harmonic Convergence.
Has Mentors: Wan has learned different bending from lion turtles.
Verdict
I vote to Avatar Yes. His shonen traits has kept until his death.