Sett began as a noxian and a vastaya, so he wasn't accepted in both parts. His father ditched him and the rest of his family to go on a world tour for battle pits. So, to get his father to come back, Sett just started brawling to the point he took control of the pit. This guy, is literally doing everything he can to see his father again, that is some determination right there.
My god if this year is going to be the year of great lores for new champions I can't wait to see what's next after Aphelios and Sett.