Iris' iris is purple:

The edits continue as I've reached chapter 18.  More 'justs' were slain, though a paltry sum compared to those that still remain.  But the most embarrassing issue I had to fix was yet again with chapter 17's physical descriptions.  For 27 editions I listed Iris' eye color as brown when it's actually purple.  Finally, on my 28th try, this is fixed.  It's a subtle shade of purple and difficult to really discern.  That's my excuse at least.  But it's definitely there if you look for it.  Because I'd recently read up on Unlimited Fafnir I was finally able to recognize the error.  Editing the book right after finishing Fafnir proves profitable yet again.

The Fafnir books describe Iris' hair color as silver, but in '100 Waifus' I list it as white.  I think white is the more accurate descriptor.  In the book covers and the anime it's clearly white.  Silver would look like a shiny gray, right?  But it's white as snow.  Perhaps the artist and the writer of this light novel series agreed to disagree. . .