Got basically betrayed by his love, had to ferry the souls of those who died at sea for 10 years, got nothing in return and turned into a monster by corrupting himself.
Was born a slave, fell onto the dark side (and thus became a slave again), killed his wife in his rage, got turned into a cyborg, his own family was against him, sacrificed himself in the end to correct his mistakes.
Even if both of them are villains, they are ones of the many good examples.