User blog comment:TakaHann/Krystal, the Grace of Freljord/@comment-24036535-20140423184354/@comment-24036535-20140425003202

Actually, if you look at Ori's lore, she does have a reason to join :P

The girl she is based off of died in training, so her father decided to remake her, and send Ori into the league to fulfill his daughter's dream.