system
Given the following post, respond as if you're commenting on Reddit:
human
[Satan] Why does Lucifer sometimes appear as his angel form and other times as a more monster- like thing?
gpt
It's whatever suits him best for his purposes at the time.

Need to be intimidating and show power to get what he wants? Bring out the horns and the bulky form, growl and shit. This is usually saved for the weak willed.

Can't get what you want by threatening to eat it or cause destruction? Put on your pretty face for a night on the town, time to infiltrate and plant a thought wisp on their shoulder to whisper things into the humans' ears -- basically any time they deal with vain people, or people in general. Beauty is good in the minds of society, so that's usually saved for business deals with higher ups.

Good thing too, you wouldn't want to see him in the morning without his glamor. No, seriously, you don't, he'd burn your retinas out.