Avatar: Vipers of Pandora.

YN LN Aka "Viper" along with his sister Kairi Imahara, were the son and daughter of Viper, the legendary pilot for the Apex predators, after his dead, YN took over his titan, while Kairi became Valkyrie, together, they were the ruthless duel in the sky, one day they are suddenly teleported to Pandora, where the RDA is battling the indigenous known as the Na'vi, together, they drive the RDA away with the help of Jake and the Na'vi, but years later the RDA return for vengeance, now both YN and his Sister must protect their new home while being the ultimate warriors who dominate the skies.