For me, the “must-haves” are:
- Ultimate Timeline: helps me to plan my review times
- Keisei Semantic-Phonetic Composition: helps to form connections with phonetic components
- Jitai Font Randomizer: stops you getting complacent and only being able to recognise the WK font
- Pitch Info: a little extra information that is actually really important
They’ve all been mentioned by others in the thread apart from Pitch Info, I think.
I also really appreciate Lesson Hover Details.