I don't mind if Nicodemus' win is countered later, so long as it takes a while. Like, if it had taken a couple of books to repair Fidellachius, rather than having it happen less than a day after Nicodemus broke it.
I kinda see the point, but then you'd have people thinking that Jim "chickened out" of leaving it broken. Having it fixed in the same book it's broken makes it clear that was the plan all along.
Maybe we could see him convince one of Harry's friends to take up a coin and leave, then have a book where you see the person slowly being corrupted, then in another book something happens and Harry has to work with whoever while they still have a coin, and at the end of that book Harry has managed to convince them to surrender the coin, but they still feel awful about what they did. Something like that. I feel like that would be something that would feel like a win for Nicodemus for long enough to have an impact, without being super depressing.
We already saw all that from Harry's perspective. We don't need to see the exact same thing from the outside. And nearly all of Harry's friends have been personally injured by one of the Denarians, there's no way in -- or out of -- Hell that they'd be stupid enough to take a coin. If they were that stupid they'd already be dead.
My main problem with Nicodemus is that none of the bad stuff he does seems to have negative consequences past the end of the book he does it in. Even when he gets Harry to touch Lasciel's coin, the very next time we see anything to do with the Harry and Lasciel's shadow thing, it's Lasciel's shadow helping him to avert a disaster, and the worst Harry ever does because of Lasciel's shadow is damage a couple of storefronts.
Shiro is still dead. Michael is still crippled. Murphy is still grievously injured. At least one Splattercon!!!-goer is dead because of Lasciel's influence.
Sure, if you only measure it on the basis of "did he successfully kill or completely turn the main character to the dark side," then sure, he's harmless.
But then, so are the vast majority of villains ever written.
I'd thought Michael indicated that there wasn't much Nicodemus could really do with that. But I might be wrong.
Too early to say. Even Nicodemus just destroying it or perverting it could be a bad thing.
This.
Again, I really don't see the appeal of 30 pages of Nicodemus doing bad things to good people and getting away with it.
Plus? A story's mainly interesting if it
challenges its protagonist in some way. Nicodemus isn't going to be challenged by that. He's challenged by people like Harry and Michael.