In no particular order, here are some further Japanese reduplicatives I've noticed lately. I guess this list will grow in fits and starts - but if you know any further words which should be here, please email me.
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bochi bochi little-by-little shito shito gently zaa zaa rushing water / white noise para para drops / sprinkling / flipping pages kira kira twinkle glitter kara kara parched / dried up pota pota dripping water guu guu snoring / fast asleep zawa zawa noisy / people talking jiro jiro staringly / scrutinizing koro koro small and round thing rolling,
high-pitched sound,
something that changespiri piri tingly / sting / burning tongue / becoming tense dan dan gradually / by degrees goshi goshi scrubbing / rubbing briskly uki uki cheerful iki iki vividly, lively bata bata rattling / clattering tara tara pouring liquid / prevaricating / slugglishly, endlessly guzu guzu tardily / complaining kotsu kotsu unflaggingly, steadily, untiringly goku goku extremely / highly moku moku mumbling shiku shiku to sob / to weep zoku zoku shiver / thrill / shudder zoro zoro in groups, in succession tsuru tsuru slipperly, smooth zara zara feeling rough hiso hiso whisperingly sara sara rustlingly, fluently, silky hair gun gun steadily sowa sowa fidgety / restless / nervous gan gan large bell / headache / intense wan wan crying / bow-wow
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