Having looked for a while for a thorough list of Japanese keywords for Remembering the Kanji volume 1, I eventually gave up and made my own. The list put together by wrightak is well known, but its downfall (not a terribly serious one admittedly) is that he attempted to stick as close to the original English keyword as possible, and partly as a consequence the list is missing quite a few characters, as well as having some pretty strained keywords (not that the English list doesn’t have its share of those as well).
I made the list on Skritter and you can get at it from the shared list page, but if you don’t use Skritter (but really you should) here are plain files of it:
And the description from the list page:
RTK 1 with Japanese keywords. Mostly kun-yomi, with many exceptions where the kun-yomi is excessively rare, or non-existent. (That said, there are quite a few words included that are rarely written in kanji, just because I found them interesting.) Meanings may or may not coincide with Heisig keywords.
This list introduces many kanji out of order as they feature in compounds of kanji in the Heisig order. It is not recommended to learn this list instead of the normal RTK 1 with English keywords; rather, finish RTK 1 with English keywords first, give it some time for the mnemonics you used for that to fade, then go through this list.
There may be some duplication which I’ll try to weed out as I review through the list.