Originally Posted by
Mike1984
Well, she's different in some ways, yes, but Rider is still fundamentally a nice person, if rather focussed on those she cares for.
There is nothing evil about being sadistic. Sure, acting on it is not good, but Rider is in a pretty extreme situation in Fate and UBW, and killing Shirou is not something she has a choice about (not to mention that he would not hesitate to kill her). Whilst that does not make getting off on torturing him acceptable, she does restrain herself somewhat and most of what she did actually helped him (if she'd been serious rather than just playing around, he'd have died there without a doubt). Not to mention that she is by no means the only Heroic Spirit to toy with their victims and get pleasure out of their fights (Lancer springs to mind...).