Feast of Hemlock Vail launches with one of the most restricted and the least restricted investigators in the game’s history. Kate Winthrop gains, outside her class, access to first aid(0 and 3), emergency aid, and survival technique from her science keyword. If it wasn’t for her access to insight(0-1) she’d be Mono-Yellow.
But this isn’t a Kate review. I say all this because Narukami gains access to more than 110 Blessed/Cursed cards, with a spread across all five classes. And his ability means you can’t ignore the good tokens and let them be a passive benefit (The way Sister Mary could theoretically.)
All previous bless/curse Investigators had an issue: making sure they got their tokens out to power their effects. Favors of the Sun and Moon only went so far to guarantee results, the same with Olive or Jaqueline’s ability to look at more tokens. Narukami’s sig ends that. Do you want to use Fey once a turn for the rest of the game? Sure. Need to trigger Beloved to pass an agility(6) check? It's on tap.
The perils of his deck building are more subtle. First, he only gets Mystic 0-3, so his high-level spells need to be blessed or cursed. Second, you’re not >forced< to make everything blursed. The temptation is to try and cram every single traited card in the deck, without a thought of economy or flow. There’s an opportunity cost to making the chaos bag even more chaotic. If you’re playing in a group, make sure everyone else is capable and eager to ride the tides of fortune.