Smiling Friends got you covered
Not just evil, but a lazy douchebag too.
I'd settle for a depiction of the devil that's actually evil instead of a fucking anti-hero.
Honestly, there's nuance in portraying Satan as an antihero, having the Devil choosing to be a force of evil to introduce darkness in a world of light, maybe even hating his job and what he has become, but doing it nonetheless while hoping/ensure that righteous people can thrive regardless of how much evil surrounds them.
It could add a lot portraying hell as a miserable place for everyone but demons that simply do their job, as a way to ultimately punish humankind for choosing evil.
Or make so that the demon who tempt mortals are EITHER a way to both test them OR cause a domino effect that ensures evil people are ultimately punished and good people overcomes them or get saved.
You don't need to turn angels evil, maybe blindsided , following of a different, rival ideology and smiting demons as a way upheld the imagery of good vs evil or purify genuine evil that breeds among demonkind.
Alternatively, if you don't want the Devil being anti-heroic because of yin-yang bullshit and want to make it more evil, you can still write him as the reason behind the eternal struggle between good and evil exits by inserting it as an aspect of his own pride, evolving his jealously or hatred toward humans by proving that he too was able to affect or "improve" God's scheme by introducing evil and negativity, or see his own decision of embody evil as the proof that he is God's greatest creation, darkness birthed within light or some shit.
I don't believe in bad ideas, I believe in bad execution and, if you wanna discuss how shit modern writers are, get in line.