10 years before Korra arrives in Republic City, Avatar Aang has passed, and Republic City is in a state of chaos. A ragtag group of vigilantes have taken it upon themselves to protect the city, though they may be in over their heads.
"Oh come now, what's the harm of adding a little fun into your life?"
His motive to be strong is his willingness to protect.
"It's our responsibility to protect the city. No one else will."