Umaru's butt is a perfect medium. Not too big, and not too small. With enough fat and softness to be very nice in the hands, with some nice firmness underneath. Official material related to Umaru's butt has shown that it's pretty much perfect, just like the rest of her body. Now imagine pulling Umaru close into your body, reaching behind her, and using your two hands to get a good grab on those lovely cheeks. The first thing you'd probably feel would be the very soft and supple skin that gently molds to the palm of your hands and your fingers. If you wanted, you could take your fingers and give her rump a nice pinch, grabbing some of her butt fat. The more you fondle her backside, the more apparent it would become just how amazing Umaru body is. So incredibly soft all over, with the perfect amount of fat, and some tightness under all of that soft. I personally think that Umaru butt would look best in shorts. That golden soft/firm ratio is practically made for wearing form fitting clothes. Wouldn't it be an amazing sight to see Umaru bend over and pull up a pair of shorts, sliding them up her legs, and then squeezing her booty into the tiny clothing? Even underneath the fabric, a decent sized hump would stick out behind her, the tight clothes clearly not enough to contain it. Umaru might need to be careful though, her underwear might be no match for her butt and find itself stuck between her cheeks. Underneath all the clothing, Umaru body would not have a single bit of misplaced fat, giving her amazing curves and the perfect amount of jiggle. I think anyone would pay money for the priveladge to stand behind Umaru just so they could see her butt move around as she walked. I imagine that Umaru's butthole would be perfectly round, and positioned in the best spot between her plump cheeks. With a slight brown coloration that blends well with the rest of her skin. Deep wrinkles and lines would surround the area directly outside her beautiful hole, running from the entrance outward. As Umaru seems to be a relatively active girl, her butt must smell a bit on the stronger side. If you were to press your nose against her anus and sniff, you would get an immediate salty type smell from the sweat that builds up between her cheeks as the day goes on, yet underneath that you would be able to pick up a slight cheap soap scent. While her butt would smell fairly strong, it would not at all be unpleasant, it would be almost intoxicating, making you want to sniff it more and more. Just like the smell, the taste of her butthole would probably be a sweaty salty taste, with a certain sharpness underneath. Given the deep wrinkles that surround the entrance, the texture on your tongue would also be quite pleasurable. Her asshole would be tight as well. Not as much as Sylphynford, but still tight enough. If there was one word to describe Umaru butt, I would probably pick lewd.