In general, voice banks that has multi pitch VCV or CVVC VB with (near to) HQ voice quality PLUS the voice itself is not "voice acted" (like for example Gachapoid and Kane Tomo which both sound very cartoonish).
Gachapoid and Kane Tomo cannot sounds "realistic" but, however, they can sound good with good amount of effort in tuning/mixing.
This is just my opinion but basically (almost) any multi pitch CVVC/VCV voicebank with "natural/no voice acted" voice type & decent voice quality can sound pretty realistic. If not realistic, at least can sound good.