- Link between related words : on vocabulary item pages, it would be neat to have a “Related vocabulary” section for vocabulary words and a list of other words on Wanikani that are similar (with a link to navigate to them if needed), together with a short one-sentence explanation of their difference in usage or meaning. There could also be 1 example sentence per word to illustrate the nuances. It could also be used simply to group words in a related lexical field (example : when on the page of a personal pronoun, show all other personal pronouns that are taught; on the page of “car”, show other ways of saying it or other means of transportation; etc.)
- If they did the previous, that could open up really cool possibilities for practicing applying our knowledge to specific content! For example, there could be mini-games that unlock as you go on with your levels. There could be a “fill in the right word” game where you have an example sentence with a choice of three close words and you have to put in the right one according to context. Or a game where you have to say if a word belongs to a specific category (ex: animals), with a new word appearing every time you get it right and the game stopping when you get it wrong. You could be timed and get bonus seconds with a right answer, and the objective would be to beat your own streak in the allotted time. The mini games could give points or other mini-trophies, parallel to our level achievements. I know this isn’t limited to kanji learning only per se, but since they do choose to teach vocabulary as well, it could be a great and very educational extension of their app.
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Wanikani, the B-side : I know there are other apps and ways to do this, but I’d love if WK allowed for reversed memorizing. Recall is way harder than recognition, and if you’re not living in Japan or exposed to the language all that much, you’re not getting a lot of memory reinforcement from just recognition in your day-to-day life. This could be something that’s optional and separate in terms of reviews etc. Like literally a “B-side”
If this would integrate our already-added synonyms it would be awesome, especially for us non-native English speakers!
Basically, I think if they found a way of adding some components to truly integrate the knowledge (instead of brute memorization out of context), with some problem-solving or way of creating links between what we know, it would make WK that much more perfect from an educational standpoint (disclaimer : I work in a field closely related to pedagogy, so I think about “how to learn better learning” a lot 
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(edit: some formatting)