I’ve created a list of the Jōyō Kanji that aren’t featured on WaniKani. I can’t guarantee that I didn’t make mistakes, as I created the list manually. It contains a total of 167 additional characters. I hope this will be of some use to those of you who have learned all the WaniKani Kanji!
Some of these characters are pretty obscure. But things like 羨・挨・拶・凄・喩・腫 are worth knowing.
Here is a useful list of the 2500 most common Kanji, ordered by frequency of appearance:
You can use this to prioritize which Kanji to learn first.