It is called soloing - whole game can be beaten playing with one character. If you have less or no party members, earned exp. points are divided on less characters. So, if you are alone, you'll get all of those.
If you have NPCs of very different alignments, they will argue and sometimes even fight to death. If you act purely evil, good NPCs will eventually leave (and vice-versa). If whole party is created by yourself, alignment is not a problem.
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Dulce et decorum est pro patria mori, adhuc dulcius pro patria vivere.
(It is sweet and glorius to die for one's homeland, even sweeter to live for it)
Horatio
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