User blog comment:B214/High School DxD Hero Discussion/@comment-29963364-20171021170255

They actually look a lot closer to their LN illustration designs (at least, to me they do).

But I do agree, this looks a bit more... "bright," and "bubbly."

But since this is a Comedy-Romance-Ecchi-Harem series (with some action), brighter colors and softer designs seem like a fitting choice.

The biggest pain I can imagine is intagrating the profile pics of new characters into this wiki. New fans will be very thrown-off by the drastically different designs, they might confuse it for a different series entirely.