Well, obviously I would get rid of the heroes before they became strong, and probably of any leader at all, be it of mine side or not, before disappearing leaving the world without any lead.

Finally made my pick: Infiltrate the party and turn the heroes against each other sounds like a choice that's both fun and smart. Not to mention, I love the thought of being a double agent, though god knows I probably won't be good at it

In a story i'm writing, The demon king will kill everyone with a gun(except the white mage), and establish modern-world peace.

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Go to sleep while the minions fight.
They're not some dumb minions. I hand picked them myself.
My cannon fodder shall prevail.

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Hrodulf and Bjornolfr, you will not be forgotten.

And if the world were black and white,
you would be my rainbow in shades of grey.

Click 'n Play!

If I had a fantasy self, it'd be a tentacle monster.

Heroes full of potential are quite a rare commodity. As I would make a poor infiltrator and negotiator for various reasons I rather not disclose, it seems best to confront them in hopes of capturing and turning them to my side before they grow powerful enough to be a real threat. Worse comes to worse, I could always make an example of them.