Levistus's_Leviathan
5e Freelancer
I'd argue the only monsters it "helps" with roleplay is Demons and Devils. Those are the only monsters that are so reliant on their alignments that it actually matters to how they act. For most other monsters, like Hags or Ogres, their motivations and personalities are more complex and alignment is detrimental if anything.It can help with role playing monsters, but not much beyond that.