Vocaloid producers have perfected the art of having them repeat words or syllables in a gratifying way. yes rhyme "yo ni" with "yo ni" 100 times in your song it WORKS. (Bitter Choco Decoration by Syudou)

yappa-pa-pa-pa-pa-pa (Salamander by DECO*27)

ya ya ...
ma ma ...
sa sa ...
(Rabbit Hole by DECO*27)