Here's some of my recommendations
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Anna Nyui she has a very wide variety of voicebanks. I like to use her colorful VB bundle but her RAW VB is also very good. She also has plenty of extra sounds in her voicebanks like vocal fry, glottal stops, and breaths. She can sound soft, powerful, mature, and high-pitched!
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Shione Ruto. A mature, female voice. Again, very wide variety of voicebanks. My personal favorites are her power voicebanks. She also has plenty of extras in her voicebanks. Rolled r's, many different types of end breaths, glottal stops, and vocal fry.
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Itako Tohoku. Youthful female voice. She only has one VB, but it includes strong and weak appends. Overall she's very beginner friendly imo.
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Misaki Koizumi, she has a mature soft voice. I don't use her much since I prefer power, but she is good for realism.
Keep in mind, there's almost no voicebank that sounds human right out the gate. It heavily depends on your flags, resamplers, mixing, tuning, etc. I mostly use Moresampler and Doppeltler64.
Here's some of my flag combinations I like to use:
CLE0B70Y0H0F0BY6P (With doppeltler64, makes voices less nasally and clearer)
Mt-50Ms7 (With moresampler, makes the voice much softer)
Mt50Ms7 (With moresampler, makes the voice tenser and more powerful)
Hope this helps!