Board Thread:Questions and Answers/@comment-36009152-20191013202225/@comment-36009152-20191014172326

Maybe we can out rule accidentally adding blue eyes, or doing it on a whim since the creator people seem to work closely together, and of course the intentional purple background (Guren's apparent real eye color).

Would offer it's purposely done for an as of yet unstated reason. Like showing Mika with blue eyes can tell us whichever event he is in is happening before he became a full vampire. When Shinoa was shown with very different yellow eyes that was absolutely to indicate to us that something was extremely wrong XD

So seeing Guren with blue eyes here may hint which time period he is in (before he became a namamari maybe), perhaps his eyes aren't naturally blue or he is appearing in a specific situation to be shown... or maybe he likes blue contact lenses!

Still really nice colors and artwork all round.