I did some work scraping discourse to find the posts for scripts. Along the way I ranked them by most likes. Take a look!
035♥, [Userscript] Lesson/Review Count in Forums, Wanikani Forums Lesson/Review Status, rfindley
025♥, The New And Improved List Of API and Third Party Apps, WaniKani Review Wrong Info Click, ShotgunLagoon
022♥, [Userscript] WaniKani Pitch Info, WaniKani Pitch Info, Invertex
018♥, [Unsupported] Dashboard Userscript: Leech, Apprentice, and Guru detail (aka SRS level progress), WaniKani SRS Level Progress, hitechbunny
016♥, [Userscript] Wanikani Mistake Delay (new, version 2.x), Wanikani Mistake Delay, rfindley
015♥, [Userscript] Self-Study Quiz, Wanikani Self-Study Quiz, rfindley
014♥, Wanikani Reorder Ultimate [old version, not working], Wanikani Reorder Ultimate 2, xMunch
014♥, [Userscript]: WaniKani Ultimate Timeline, Wanikani Ultimate Timeline, rfindley
011♥, [Unsupported] Leech training script, WaniKani Leech Trainer, hitechbunny
009♥, [Userscript] WaniKani Show Specific SRS Level in Reviews, WaniKani Show Specific SRS Level in Reviews, seanblue
009♥, [Userscript] WaniKani Lesson Filter, WaniKani Lesson Filter, seanblue
008♥, [Unsupported] Userscript: Dashboard Level Progress Detail (srs stages on progress bars), WaniKani Dashboard Level Progress Detail - Source code, hitechbunny
008♥, New User Script: Common Vocabulary Indicator, Wanikani Common Vocab Indicator, dtwigs
007♥, [Userscript] Dashboard Progress Plus, Wanikani Dashboard Progress Plus, rfindley
005♥, [Userscript] WaniKani Review Asc/Desc SRS Order, WaniKani Review Asc/Desc SRS Order (Radical -> Kanji -> Vocab), Mempo
005♥, [Userscript] WaniKani Lesson User Synonyms v2, WaniKani Lesson User Synonyms 2, irrelephant
004♥, [Userscript] WK Real Numbers, WaniKani Real Numbers, Mempo
004♥, [UserScript] WK Forums: Hide Users' Posts, https://greasyfork.org/en/scripts/28590-wk-forums-hide-users-posts, DaisukeJigen
004♥, [OBSOLETE] Wanikani Override ("ignore answer button"), Wanikani Override, Mempo
004♥, [Userscript] WaniKani Katakana Madness, WaniKani Katakana Madness, Luke-Filewalker
004♥, [UserScript] SRS Grid Details, WaniKani SRS Grid, DaisukeJigen
004♥, [Userscript] For the goddess!, For the goddess!, ccookf
004♥, A fix for the Dashboard's "Next Day" lies!, WK fix 'Next Day', tenderwaffles
003♥, WaniKani SRS Reorder Button, WaniKani SRS Reorder Button, Towe
003♥, WaniKani Denial Mode, WaniKani Denial Mode, nibarius
003♥, https://community.wanikani.com/t/userscript-wanikani-double-check/8396, https://greasyfork.org/en/scripts/35063-wanikani-double-check, Ethan
003♥, https://community.wanikani.com/t/userscript-stroke-animation-for-reviews-and-lessons/9741, https://greasyfork.org/en/scripts/12034-wanikani-nippongrammar-extension, Ethan
003♥, https://community.wanikani.com/t/userscript-show-review-srs-level/18493, https://greasyfork.org/en/scripts/31571-wk-show-review-srs-level, ccookf
003♥, https://community.wanikani.com/t/userscript-satori-reader-wanikani-lookup/19959, https://greasyfork.org/en/scripts/33762-satori-reader-wanikani-lookup, stevie92
003♥, https://community.wanikani.com/t/userscript-burn-reviews-ver-224/13423, https://greasyfork.org/en/scripts/20169-wanikani-burn-reviews, jonnydark
002♥, https://community.wanikani.com/t/userscript-wanikani-review-audio-tweak-reuploadfixed/21423, https://greasyfork.org/en/scripts/10184-wanikani-review-audio-tweak, seanblue
002♥, https://community.wanikani.com/t/userscript-tab-key-to-info-click/18911, https://greasyfork.org/en/scripts/31455-wanikani-tab-key-to-info-click, elmeunick9
002♥, https://community.wanikani.com/t/userscript-prevent-your-answer-was-a-bit-off-answers-from-being-accepted-aka-close-but-no-cigar/7134, https://greasyfork.org/en/scripts/7478-wk-but-no-cigar, Ethan
002♥, https://community.wanikani.com/t/userscript-item-marker/12914, https://greasyfork.org/en/scripts/18582-wanikani-item-marker, irx11
002♥, https://community.wanikani.com/t/userscript-community-mnemonics-v0978/7367, https://greasyfork.org/en/scripts/7954-wk-community-mnemonics, Samuel-H
002♥, https://community.wanikani.com/t/userscript-burn-manager-review-resurrect-retire/13001, https://greasyfork.org/en/scripts/18822-wanikani-burn-manager, rfindley
002♥, https://community.wanikani.com/t/userscript-additional-resource-links-stroke-order/10623, https://greasyfork.org/en/scripts/13888-wanikani-additional-resource-links-stroke-order, hoovard
002♥, https://community.wanikani.com/t/script-item-info-autoexpander/17215, WaniKani Review Wrong Info Click, mvi
002♥, https://community.wanikani.com/t/new-version-of-kunon-script-wk-custom-review-question-kunon/7597, https://greasyfork.org/en/scripts/8193-wk-custom-review-question-kunon, hoovard
001♥, https://community.wanikani.com/t/wk-reviews-the-final-countdown-userscript/11806, https://greasyfork.org/en/scripts/16442-wanikani-review-countdown-timer, GangsterOfBoats
001♥, https://community.wanikani.com/t/wk-fake-numbers-userscript/7372, https://greasyfork.org/en/scripts/7856-wanikani-fake-numbers, nibarius
001♥, https://community.wanikani.com/t/wanikani-lesson-balance-script/21136, https://greasyfork.org/en/scripts/34858-wanikani-lesson-balance, hitechbunny
001♥, https://community.wanikani.com/t/userscript-wanikani-review-srslevel-indicator/11382, https://greasyfork.org/en/scripts/15582-wanikani-review-srs-indicator, Mempo
001♥, https://community.wanikani.com/t/userscript-wanikani-quick-info/8431, https://greasyfork.org/en/scripts/9814-wanikani-quick-info, Ethan
001♥, https://community.wanikani.com/t/userscript-wanikani-procrastination-annihilation/11253, https://greasyfork.org/en/scripts/14972-wanikani-procrastination-annihilation, Mempo
001♥, https://community.wanikani.com/t/userscript-wanikani-lightning-mode/10201, https://greasyfork.org/en/scripts/12853-wanikani-lightning-mode, rfindley
001♥, https://community.wanikani.com/t/userscript-vocabulary-for-dashboard-panel-115/15905, https://greasyfork.org/en/scripts/27038-vocabulary-for-wanikani, Eekone
001♥, https://community.wanikani.com/t/userscript-self-quiz-orientated-lessons/19063, https://greasyfork.org/en/scripts/31747-self-q-o-l, ccookf
001♥, https://community.wanikani.com/t/userscript-script-that-fixes-wanikani-shake-bug/18141, https://greasyfork.org/en/scripts/30057-wanikani-shaking-for-no-reason-bug-fix, bertoncelj1
001♥, https://community.wanikani.com/t/userscript-i-dont-know-button/7231, https://greasyfork.org/en/scripts/7576-wanikani-i-don-t-know-button, nibarius
001♥, https://community.wanikani.com/t/userscript-hide-context-sentence-translation/11215, https://greasyfork.org/en/scripts/14844-wanikani-hide-context-sentence, rfindley
001♥, https://community.wanikani.com/t/userscript-golden-burn/11464, https://greasyfork.org/en/scripts/15781-wanikani-golden-burn, rfindley
001♥, https://community.wanikani.com/t/userscript-auto-wrapup/19090, https://greasyfork.org/en/scripts/31784-auto-wrapup, zdennis
001♥, https://community.wanikani.com/t/user-script-list/14772, WaniKani Real Numbers, Mempo
001♥, https://community.wanikani.com/t/script-idea-leech-o-meter/19758, https://greasyfork.org/en/scripts/33237-leech-o-meter, hitechbunny
001♥, https://community.wanikani.com/t/old-versionuserscript-burn-reviews-v1003/6806, https://greasyfork.org/en/scripts/7007-wanikani-burn-reviews, Samuel-H
001♥, https://community.wanikani.com/t/homophone-explorer/13415, https://greasyfork.org/en/scripts/20150-homophone-explorer, Thaos
000♥, https://community.wanikani.com/t/you-should-already-know-this-reading-wtf-lesson/15170, https://greasyfork.org/en/scripts/25128-wanikani-you-should-already-know-this-reading, Mempo
000♥, https://community.wanikani.com/t/wanikanify-for-firefox/4288, https://greasyfork.org/en/scripts/5164-wanikanify-vocabularizer, looki
000♥, https://community.wanikani.com/t/wanikani-level-duration-not-working/15149, https://greasyfork.org/en/scripts/235-wanikani-level-duration/code, Gossepojk
000♥, https://community.wanikani.com/t/wanikani-audio-button-sizer/8379, https://greasyfork.org/en/scripts/9702-wanikani-audio-button-sizer, teeth7
000♥, https://community.wanikani.com/t/userscriptuserstyle-wanikani-level-vocabulary-grid/13885, https://greasyfork.org/en/scripts/21628-wanikani-level-vocabulary-grid, normful
000♥, https://community.wanikani.com/t/userscript-wk-lesson-spoiler-tags/15940, https://greasyfork.org/en/scripts/27125-wk-lesson-spoiler-tags, karstux
000♥, https://community.wanikani.com/t/userscript-wanikani-wrong-answer-delay/15513, https://greasyfork.org/en/scripts/26216-wanikani-wrong-answer-delay, bertoncelj1
000♥, https://community.wanikani.com/t/userscript-wanikani-wrap-up-button-enhancement/15088, https://greasyfork.org/en/scripts/24928-wanikani-wrap-up-button-enhancement, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-self-study-plus-v-0113-unsupported-for-now/6444, https://greasyfork.org/en/scripts/5899-wanikani-self-study-plus, Ethan
000♥, https://community.wanikani.com/t/userscript-wanikani-review-feedback-sounds/11689, https://greasyfork.org/en/scripts/16230-wanikani-sounds, Jexah
000♥, https://community.wanikani.com/t/userscript-wanikani-notify/14542, https://greasyfork.org/en/scripts/23453-wanikani-notify, DaisukeJigen
000♥, https://community.wanikani.com/t/userscript-wanikani-note-attention-grabber/15773, https://greasyfork.org/en/scripts/26736-wanikani-note-attention-grabber, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-never-wrong/8172, https://greasyfork.org/en/scripts/9224-wk-never-wrong, Ethan
000♥, https://community.wanikani.com/t/userscript-wanikani-multiple-answer-input/15159, https://greasyfork.org/en/scripts/25102-wanikani-multiple-answer-input, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-lesson-tab-transmutation/12189, https://greasyfork.org/en/scripts/17050-wanikani-lesson-tab-transmutation, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-lesson-spoiler-removal/14550, https://greasyfork.org/en/scripts/23485-wanikani-lesson-spoiler-removal, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-lesson-overlearning/14208, https://greasyfork.org/en/scripts/22459-wanikani-lesson-overlearning, normful
000♥, https://community.wanikani.com/t/userscript-wanikani-left-right/14312, https://greasyfork.org/en/scripts/22722-wanikani-left-and-right, DaisukeJigen
000♥, https://community.wanikani.com/t/userscript-wanikani-kana-review/14821, https://greasyfork.org/en/scripts/24262-wanikani-kana-review, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-just-the-vocab-skip-radicals-and-kanji/14978, https://greasyfork.org/en/scripts/24615-wanikani-just-the-vocab-skip-radicals-and-kanji, forgottenmems
000♥, https://community.wanikani.com/t/userscript-wanikani-dashboard-active-topics-panel/11274, https://greasyfork.org/en/scripts/15028-wanikani-dashboard-active-topics-panel, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-customize-wrap-up/15091, https://greasyfork.org/en/scripts/24931-wanikani-customize-wrap-up, alsanchez
000♥, https://community.wanikani.com/t/userscript-wanikani-anki-mode/8399, https://greasyfork.org/en/scripts/9747-wk-anki-mode, oregu
000♥, https://community.wanikani.com/t/userscript-wanikani-anki-mode-active-support/14399, https://greasyfork.org/en/scripts/15950-wanikani-anki-mode, Mempo
000♥, https://community.wanikani.com/t/userscript-wanikani-alc-add-link-to-alc-usage-examples-on-vocab-pages/6484, https://greasyfork.org/en/scripts/6051-wanikani-alc, BreadstickNinja
000♥, https://community.wanikani.com/t/userscript-speech-recognition-experiment/9946, https://greasyfork.org/en/scripts/12431-wk-voice-recognition-experiment, Ethan
000♥, https://community.wanikani.com/t/userscript-renbow-hacks-level-up-alert/11865, https://greasyfork.org/en/scripts/16539-renbow-h4x, horusscope
000♥, https://community.wanikani.com/t/userscript-progress-colour-change/13575, https://greasyfork.org/en/scripts/20637-wanikani-progress-colours, frugal
000♥, https://community.wanikani.com/t/userscript-markdown-notes-updated/11462, https://greasyfork.org/en/scripts/15778-wanikani-markdown-notes, rfindley
000♥, https://community.wanikani.com/t/userscript-lessons-touchpad-swipe-navigation/14882, https://greasyfork.org/en/scripts/24424-lessons-touchpad-swipe-navigation, mrowqa
000♥, https://community.wanikani.com/t/userscript-lattice-extension/12938, https://greasyfork.org/en/scripts/18636-wanikani-lattice-extension, irx11
000♥, https://community.wanikani.com/t/userscript-kaniwani-anki-mode/12557, https://greasyfork.org/en/scripts/17835-kw-anki-mode, Mempo
000♥, https://community.wanikani.com/t/userscript-info-page-tweaks/15479, https://greasyfork.org/en/scripts/26164-wanikani-info-page-tweaks, DaisukeJigen
000♥, https://community.wanikani.com/t/userscript-friendly-font-sizes-for-tablets-in-landscape-orientation/8206, https://greasyfork.org/en/scripts/9304-wanikani-landscape-friendly, Ghabry
000♥, https://community.wanikani.com/t/userscript-forum-bar/14336, https://greasyfork.org/en/scripts/22785-wanikani-forum-bar, rfindley
000♥, https://community.wanikani.com/t/userscript-fade-in-down-wrong-answers/8195, https://greasyfork.org/en/scripts/9278-wk-fiddlesettings, Ethan
000♥, https://community.wanikani.com/t/userscript-do-you-even-kana-okurigana-matcher/8440, https://greasyfork.org/en/scripts/9826-wk-do-you-even-kana, Ethan
000♥, https://community.wanikani.com/t/userscript-condensed-progress-bars/14285, https://greasyfork.org/en/scripts/22648-wanikani-condensed-progress-bars, DaisukeJigen
000♥, https://community.wanikani.com/t/userscript-chat-posts-search-results-direct-link/10667, https://greasyfork.org/en/scripts/13744-wanikani-post-search-direct-link, rfindley
000♥, https://community.wanikani.com/t/userscript-auto-commit-the-end-of-the-enter-key/11825, https://greasyfork.org/en/scripts/16466-wk-auto-commit, johmik
000♥, https://community.wanikani.com/t/userscript-accept-vocab-readings-as-a-correct-meanings/15335, https://greasyfork.org/en/scripts/25655-wk-vocab-as-reading, wilddamon
000♥, https://community.wanikani.com/t/solved-trying-to-create-a-userscript-to-show-context-sentences-not-included-in-currentitem/15834, https://greasyfork.org/en/scripts/26868-wk-context-sentences/code, nelemnaru
000♥, https://community.wanikani.com/t/script-wanikani-links/14862, https://greasyfork.org/en/scripts/24370-wanikani-links, DaisukeJigen
000♥, https://community.wanikani.com/t/review-count-analysis/9733, https://greasyfork.org/en/scripts/12018-wanikani-review-count-analysis, hoovard
000♥, https://community.wanikani.com/t/request-granted-as-userscript-auto-show-context-sentence-when-answered-right/15594, WaniKani Review Wrong Info Click, polv
000♥, https://community.wanikani.com/t/purple-wanikani/11268, https://greasyfork.org/en/scripts/15031-purple-wanikani, ffao
000♥, https://community.wanikani.com/t/language-connection-fridge-magnet-poetry-based-on-a-koichi-learning-tip/9221, https://greasyfork.org/en/scripts/11137-wk-language-point-connector-cards, hoovard
000♥, https://community.wanikani.com/t/lang-8-all-corrections-view-enhancer/9327, https://greasyfork.org/en/scripts/11160-lang-8-all-corrections-view-enhancer, Kaimera
000♥, https://community.wanikani.com/t/j-sound-reading-keyboard-shortcut-in-vocab-pages/12834, https://greasyfork.org/en/scripts/18388-j-sound, Nuke
000♥, https://community.wanikani.com/t/better-contrast-for-colourblindness-colour-change-script/8844, https://greasyfork.org/en/scripts/10491-customlevelcolours, hoovard
000♥, https://community.wanikani.com/t/auto-play-wanikani-audio-on-correct-review/15118, https://greasyfork.org/en/scripts/10184-wanikani-review-audio-tweak, holyone2