1. Both have child like imaginations, but have adult-like wisdom.2. Both have a relationship with their male friends that isn't quite romantic, but not quite platonic.3. Both rather live outside their respective worlds. Leslie would rather live in Terabithia and Quorra would rather live in The Real world.
If you notice, during Leslie's last scene it is raining. When you see rain in cinema, it often means cleansing. This means that she is going to heaven after all.