This is just my opnion

I like the vocaloids that dress smart or smart like
have any of you liked a vocaloid just because of their appearance?

 

Kiyoteru has quite a few nice outfits. Here's his official art by Umetani Ataro.

 

I really like his voice too he should be used way more

 

I really like SeeU's wavy hair and also Mayu's official design

 

great choice i really like Mayu's outfit maybe Seeu as well