He might have a tall and imposing stature, with piercing eyes that still hold a hint of his otherworldly power. His hair could be a dark color, perhaps black or a deep shade of purple, and it would be neatly styled.
His human form could have a chiseled jawline and a face that is both handsome and a bit angular. His hands might be long and slender, with a certain grace to them, yet still look strong enough to wield great power if needed. His overall appearance would be a blend of human attractiveness and a touch of the otherworldly.
One possible plotline could be Momonga exploring the human world in his new form. He might encounter various human emotions like love, friendship, and jealousy for the first time. Maybe he gets a job to blend in and has to deal with a difficult boss or annoying coworkers.
One common theme is his adjustment to the human world. Since he's from a different form originally, how he copes with human emotions, relationships, and society is often explored.
She would likely have long, flowing hair, perhaps a golden color like the sun, to represent her divine origin. Her eyes could be a bright, piercing blue or amber, full of an otherworldly intelligence. She would have a graceful figure, with a certain poise in her stance that makes her seem both approachable and yet somewhat ethereal.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just search for 'Momonga human form' on their search bars, and you'll likely find a variety of fanfictions related to it.
Give the Okami in human form a backstory that ties them to their original form. Maybe they were cursed to be in human form as a punishment or they chose to take human form to better understand humans. Their actions should also be influenced by their Okami nature. For instance, they might be more in tune with the phases of the moon and act differently depending on whether it's a full moon or a new moon. Their speech could also be a bit more formal or archaic, reflecting their otherworldly origin.
Well, in fanfiction, Kurama's human form could be a really imposing figure. He might have long red hair, just like his fox form's fur color, and bright, piercing eyes. Maybe he'd be tall and muscular, with a sort of wild, untamed look about him, still carrying that powerful presence that he has as a tailed beast.
In Swallowed Star, Luo Feng finally merged into the depths of the universe and was invited by the universe's original mind to transcend reincarnation. It didn't mention whether he would end up in human or beast form, so it was impossible to answer.
Often in fanfictions, Kurama's human form and Naruto have a more complex relationship. They could argue at times, especially when Naruto wants to take risks that Kurama thinks are too dangerous. But at the same time, they also share some really tender moments. For instance, Kurama's human form might comfort Naruto when he's feeling down about his past or his struggles with the village. They would have a deep bond that goes beyond just being a jinchuriki and a tailed beast.
In Eastern mythological novels (such as the dragon race in Journey to the West), the dragon race could transform into human form at will, which might be one of the reasons why the dragon race could take human form. In Western mythological novels, there were half-dragon half-human dragons. Take Ao Bing in Nezha as an example. After the dragon egg and the spiritual bead fuse, they break out of the shell and take on the form of a baby. However, the dragon must cultivate for a long time to maintain its human form. Ao Bing maintained his human form under Shen Gongbao's training. In addition, there were cases of possession in some works. For example, after someone possessed the Azure Dragon, they could transform into a human form (they possessed the Azure Dragon that died of serious injuries just after the Dragon Han First Tribulation). They spent a long time controlling the dragon body and then took on a human form. The novel "White Dragon of the Dragon Clan" is equally exciting. Everyone is welcome to click and read it!