eh, I admit to being one of those crazy people who make anthro characters with random colors. But I usually try and kinda go with a theme (like green and black, or all one color, ect ect.)
Truthfully, I think more of my characters are unnaturally colored then ones that are naturally colored xD (one reason may be because I love making hybrids, haha....and I love colors...so sometimes normal color schemes on animals are just too boring for me.)
Although, my fursona is natural colored, she's a english angora rabbit with the "fawn" color scheme, which is a true color scheme for that type of rabbit. but my namesake "Shirei" is definitely no where near natural xD (then again, a serval-jackal hybrid demon with undead properties really isn't very normal, is it?)
Yeah, I don't mind unnatural colors, even though I prefer natural ones, myself.
What bugs me though is when a character's design is overly complicated, with a billion little accessories and markings that are impossible to remember. x-x It makes it difficult if you're trying to draw a picture of the character or something.
Lulz yeah. Unnatural colors are great when put together so it's not a mass of RED ON BLUE AND YOUR EYES ARE BURNING OUT OF YOUR HEAD AND WHOA IS THAT LIME GREEN AND BRIGHT PINK AND RAINBOW SPARKLE STARS WITH MAGICAL WINGS AND A DREAM PENDANT AND IT'S A DRAGON LLAMA ANGEL DEMON FOX WOLF HORSE WITH A TRAGIC PAST AND ITS SO BRIGHTLY COLORED ITS LIKE A RAINBOW OF PAAAAAAAIIIIIIIIINN.
...I lean towards natural colours, myself. I'm pretty conservative artistically. I mean, I love messing with markings and such, but I very rarely include unnatural colours. This should be relatively obvious...I mean, my fursona is as common as they come, nothing original at all. x_x; Which I still admit is odd, since IRL my hair has been consistently heavily streaked firehydrant red against my natural brown for a good 5+ years, because normal colours bored me.
But in other peoples' fursonas/characters, I don't really care. But when it comes to a commission...I honestly much prefer drawing more conservative designs. They just seem more aesthetically pleasing to me. A little originality is always welcome, but too much makes me feel like I just huffed a dozen gallons of radioactive spray paint once I'm done drawing.
My fursona is from an unusual/unique species so I can't say matching colors to the real animal. But, when designing my sona I always had natural camouflage and feature-hiding color patterns in mind. It isn't really visible on this current 100x100 icon I have here, but I'm curerntly working on a characterreference that shows this.
Whatever works. Us humans can have some pretty weird mutations ourselves, as can some members of the animal kingdom.
Though I do prefer somewhat natural. As in "Well, the fur was brown but now it's three colours. Yeah, the bleach hurt." not "Well, it's a neon pink heart that changes to star when I'm happy, and glows in the dark and etc..."
I don't care one way or the other, since of my fursonas I have both. I have blue or yellow mice, a brown bunny, grey-blue hippo, and a bird with rainbow plumage. I like variety, I dye my hair all the time so why should my characters be boring and always follow the rules of nature?