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This is a submission for the Anatomically Correct Series.

enter image description here Image credit: japhers.tumblr.com

Originating from Japan, the majority of depictions of Oni (Kijo to refer female Oni/demons) are hideous, gigantic (taller than the tallest man!) ogre-like creatures with a single horn or multiple horns emerging from their heads, yellow eyes, sharp claws, fang-like tusks, and wild hair.

Their habitats are known to be remote mountains, caves, islands, if not Hell. Interestingly their omnivorous diet contains of alcohol (what kind of tolerance could they build up? Would they be immune to intoxication or always acts like it it doesn't even matter?)

One particular interesting thing about them is their skin color. Their most common skin color is red and blue, with red ones being more aggressive and blue ones being more clever(there's also black and yellow skin Onis, but that's easy to answer.) I was thinking what kind of mutation or evolution could cause their skins to match their behavior, or just in general?

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  • $\begingroup$ So is this question mostly based on the skin color behavior stuff, or is it about the while shapang, if so I need a specific height, like we talking about 8ft or 13ft? $\endgroup$ – Amoeba May 1 '18 at 0:22
  • $\begingroup$ It's mostly based of skin color and behavior, although 8-13 feet is a good estimate on what I'm thinking. There can always be small Onis. $\endgroup$ – TGCF May 1 '18 at 0:27
  • $\begingroup$ My customary -1 for image without credits (and probably with CC-incompatiblle license) $\endgroup$ – Mołot Oct 23 '18 at 21:53
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Okay I got you some fun old info well first things first, Alcohol tolerance should be pretty easy for something as massive as 8-13ft, also considering it is of Asian descent then its tolerance of Alcohol is even more increased on account that Asians and Europeans have the highest alcohol tolerance of any other race, but if you want even more then you are going to need more of the special enzymes for digesting alcohol and bigger livers. Humans are already omnivores so no change is needed there.

Next is the size, 8ft is pushing it for something with a relatively human shape and at 13ft survival is 0. but don't worry all hope is not lost because all you need to increase that survival chance is to shift the organ sizes and body shape. So taking tips from our real life giants the major organs that need this is the liver, lungs, heart, and stomach. Now lets go to everybody's favorite subject, mitochondria density, yes the mitochondria will be needing to decrease the density of mitochondria per cell so the body does overheat, causing the proteins to unwind and the body turns into a pile of mush. Also considering they will live in hot climates(well hell is listed as on =e of their environments so I'm guessing its hot) then they will need to take a page out of the elephants survival as a giant guide, and get the most surface area it can buy having wrinkly skin. Now for the actual body shape, it will need pillar like legs(like an elephant), a wide frame, proportionally shorter arms, and probably smaller brains because the energy needed to maintain such a huge stature.

Okay last but not least we go to the skin color behavior correlation thingy, and while yes their is a disease that turns you blue(Methemoglobinemia) its not the best thing to base a species on. So what I propose is their skin color, and behavior actually comes from their environment and what they eat. this has actually happened to some African Tribe(Tuareg) and could be used to explained the behavior of the diffrent colors by saying its from culture or just that the red ones have a constant rash that causes them to be aggressive all the time.

Hope the answer helps! (;

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    $\begingroup$ As far as I know, the alcohol tolerance in (east) Asia is pretty low compared to Europeans. Search for "Alcohol dehydrogenases I" for further information (the wiki-article is good). $\endgroup$ – Anonymous Anonymous May 1 '18 at 9:11
  • $\begingroup$ @AnonymousAnonymous good point, but it is still higher than everyone else aside from Europeans $\endgroup$ – Amoeba May 2 '18 at 3:07
  • $\begingroup$ Better alcohol tolerance is not that hard to evolve either you just need the right enzymes, their are naturally occurring fruits with alcohol content, if a significant part of their diet is a fruit high in alcohol they will evolve high tolerance. which kinda makes sense for the fruit too as it will keep many smaller things from eating their fruit. $\endgroup$ – John Nov 20 '18 at 14:39
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Their skin color could be related to the same hormones that control behavior. The balance of these hormones causes aggressiveness, cleverness, etc, and the metabolized byproducts build up in the skin as pigments.

They could be obligate drinkers. They cannot synthesize some required protein or hormone, or something like it without alcohol. Alcohol does not lead to intoxication, but the lack of it would cause strange behavior and health problems.

For the size, bones would have to be proportionally larger than a human's. The body would probably be proportionally wider than a human's as well with bigger feet. Balance would be key since they would pretty heavy and a fall with all of that extra mass would be dangerous.

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