Most I use are geared towards lessons or reviews, which won’t matter for you if you’re going to mostly use Self Study. Here are some that should still be useful though:
- Additional Filters (for Self Study) - this adds a few more options to Self Study. Most are still geared towards regular usage of WaniKani, but the “related items” filter could be useful.
- Pitch Info - Show pitch diagrams on vocab pages.
- Keisei - Show phonetic components on kanji pages.