appearance - hairstyle
WE LIKE PINEAPPLE HAIR Um, what is there to say? It has a clear relationship with the
pineapple. It's a purple pineapple. Best hairstyle ever.
I even drew it kufufufufu.
appearance - outfit
In the manga and anime, the general look seems to be the same. On the downside, the anime simplified his gloves, rings and various other jewelry but other than that he sports a general green look in the form of what seems, to me, like a simplified military-esque uniform (green and purple). Is it just me? I'd hope not, the shirt, too-- while not of camouflage colors, it is within the same style range. Actually, the green uniform is the Kokuyou school uniform. I don't actually know why it appears as black in the manga - but in the anime too (depicted to the right). The general look is just green, hues of blues and purples and the random red eye. I have to admit ... the leather look (if you didn't know this was a school uniform, that is) ... it's hot! He even wears black gloves to complete the look.
appearance - ten years later

Mukuro's appearance ten years later hasn't changed much aside from his face being matured. His eyes and that endearing pineapple stay the same. His hair is much, much longer and seems to be held in a ponytail now. Then this really makes me wonder - how does that pineapple stay and how is it physically possible? Well, it's Mukuro.