User blog comment:Vanakita/What makes a good original vocaloid design?/@comment-3076833-20140909165442/@comment-5051846-20140910084215

I tempted to put Cul and Big Al down to coincidence, for several reasons. Firstly they are Vocaloids for different languages, so the illustrators aren't as likely to cross paths, it's most probable that Cul's artist isn't even aware of Big Al. Secondly, Big Al isn't popular, so what motivation would the artist have to copy him? Then there is the fact that Cul's spikey and red style of design was determined by other factors – a rock suited voice and a previously red colour scheme on her old design; this rules out several things which can be related to Big Al. And finally, I've seen wilder similarities in things that are definitely not influenced by each other, so I know that strong mirroring of elements can happen simply by chance.

In essense, though the similarities could build a decent case in a different environment, the context and lack of motives makes me sceptical.（｀＾´）