I've been a huge fan of these virtual singers since I was 12, and I've never done any design fanwork about them. Recently I really got into flat and minimal design so I thought that because the main feature of Vocaloids (besides their voice, of course) are their unique colour palettes and outfits, they'd be the perfect candidates for some minimal design practice.
And fans, I only did these five Vocaloids because they are my favourites so don't get mad if I didn't do your favourite Vocaloids :)