Toyo Ozaki, Phantasy Star III's character designer, posted a ton of artwork on Geocities and some other equivalent host back when that was the thing to do. Those pages are long gone but here's all the artwork from them. I made no attempt to sort these and even included things like background images that maybe weren't created by Toyo Ozaki. Whatever, who cares, enjoy.
Please note, there is one debatably NSFW image in here.