Need Help with a BBEG Stat Block, Any Ideas?

So I have been preparing for my next campaign that Im running for my school's DnD club, and Ive run into a problem with the BBEG Stat Block. Mainly, that I cant find a good one.

For context, the campaign I'm planning is based on classic fairy tales(I was reading Fables when I came up with the idea) and my plan is for the BBEG to be Rumpelstiltskin, so overall evil fey vibes. I've been generally struggling to find one that fits the overall vibe I'm going for or one that would fit the party's level (party will start out at level 3 but will level up throughout the campaign). Do you guys have any suggestions I should check out? 

Not quite a direct answer, but I’d suggest not finding one now. Wait until the party is ready to face it. Mainly, because then you’ll know what level they are, so you can plan the correct challenge. 
Also, it will give you an open slate in case something cool happens in game that gives you an idea for the kind of monster you want to use and you want/need to change the plan.

Certainly having an idea about the kind of BBEG there is and their plans is a good thing and can help with he story, but don’t get attached to a specific stat block until you need to. 

Thank you for the advice! I've got a general idea of their plans(wants to destroy/take control over the concept of destiny), so I'm pretty good there.

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So I have been preparing for my next campaign that Im running for my school's DnD club, and Ive run into a problem with the BBEG Stat Block. Mainly, that I cant find a good one.

For context, the campaign I'm planning is based on classic fairy tales(I was reading Fables when I came up with the idea) and my plan is for the BBEG to be Rumpelstiltskin, so overall evil fey vibes. I've been generally struggling to find one that fits the overall vibe I'm going for or one that would fit the party's level (party will start out at level 3 but will level up throughout the campaign). Do you guys have any suggestions I should check out? 

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I am actually doing something very similar! I started out with The Three Little Pigs and Little Red Riding Hood involving a werewolf outbreak, but I’m not sure what to do after I’ve exhausted all of the were monsters. I thought about introducing giants from Jack and the Beanstalk, but that’s as far as I have gotten.

I’d love to compare notes sometime if you are interested. Maybe we can make each other’s campaigns better!

For a fey-type trickster BBEG, you're better off putting the time into the encounter than the stat-block. Rumplestiltskin was never portrayed as a swordmaster or a potent abjurer, so you could probably punt him and win.

the challenge would be in getting to punt him. He's a trickster, and an arrogant one at that, so would likely contrive some dastardly traps and taunt the party on the way through them, all leading up to the final "boss fight" which would be something else which he has put in to kill them, and an impervious door through to him. Then, you should make some notes of things Rumplestiltskin missed - the door is impervious, but the wall isn't, for example.

One the party has defeated his champion and worked out how to get through the door, he will go to pleading and bargaining, and if they choose to try and kill him, he's a commoner for physical stats.