人 - にん - ninja; じん - jeans
直 - ちょく - choke; じき - um, … “junk.”
正 - しょう - show; せい - saber
So for example, a mnemonic adaptation:
正直 - しょうじき - 話: “If a man is truly honest, he’ll しょう you his じき.”
I also have some that help me remember if the 言葉 is 連濁 – I add “stairs” to whatever the second part of the story is, or somehow otherwise make stairs an important part of the mnemonic.
I still struggle with げつ and がつ, and I think I have the mnemonic wrong. For がつ, I use “scoring an A”, and for げつ, I use “E for Everybody movies” – movies that everybody can watch and like. But I don’t think they are truly working for me.
I’d be curious to hear of other peoples’ mnemonic inventions, to help fine-tune difficult memory points.