I don't know a thing about 5th ed, but in 3/3.5, warlocks had to be either evil...or chaotic. So, yeah, my warlock of preference would be some chaotic good person just to mess with the trope. Annoyingly, a lot of the good powers were evil-themed, but some could be fiddled with thematically.

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Fearless creatures, we all learn to fight the Reaper
Can't defeat Her, so instead I'll have to be Her