If you want to do an evil playthrough I think, a Warlock is thematically a good choice. As a build, Sorlock and Padlock are equally overpowered. You can turn the Sorlock into a machine gun eldritch blaster and use spells like Hunger of Hadar. The Padlock smites everything to death in seconds and can do it again after a short rest. An alternative could be a spore druid, an army of zombies sounds damn evil to me
for the last slot I'd always go with Lae'zel, plenty of evil vibes anyway and she is a great tank and damage dealer with access to one of the best weapons early on.
