I think this is the least worst way to do it, especially for writing- tacking "-ish" on to stuff makes her sound drunk, and sprinkling "poi"s around gets jarring unless all the other Japanese inflections are present as well.

Though it could always be worse, a couple times in the anime (and other works), Yuudachi ends up sounding more like she's related to Mokona from MKR.

"This is probably a stupid question, but . . ."