Red Arrow - Green Arrow's Arcade Ending - Injustice: Gods Among Us

The alter-ego of Roy Harper, Red Arrow, was inspired to become a costumed hero after Superman killed  Green Arrow & Black Canary. 

Striking out on his own, he protected Star City independently of both the Insurgency and One-Earth Regime. 

After Green Arrow - from Earth One - defeated and banished Superman to the Phantom Zone, he visited Star City to pay his respects to his fallen Earth Two counterpart. There, he came across Red Arrow. 

Impressed by his skills, he offered to take him in and train Harper so that, when the time came and he returned to his own world, there would always be a hero protecting the city.