Awevil holds a light brown staff. He sits on a floating cushion-like pillow. He wears a black robe. His skin is like a light colored gray, and he has a mark on his forehead, he also has two small horns. His two ears and nose are really pointy. His eyes are black on the inside and have an outline of blue. His eyebrows and beard are both red. His legs are crossed.
Awevil appears as an elderly figure with gray skin, slit-pupil yellow eyes with black sclerae, long red beard and a gourd-shaped head with small horns. The kanji kyou (凶, "bad luck") is written on his forehead. He wears black and white priest robes, as well as straw sandals (zori). He carries a gnarled wooden staff and sits bow-legged on a floating purple zabuton.
As his name and Medallium Entry imply, he is incredibly evil, just for the sake of it.
In the Springdale Sewers, activate all 3 switches, the last of which is behind a Rank S Watch Lock, to raise the floodgate in the middle of the area. Behind you will find Awevil, who can be challenged once a day until he's befriended through normal methods.
There are three card keys that you'll need to collect and use at the floodgate in the middle of the Springdale Sewers.
The Blue Card can be found in a chest on the Springdale business tower's 4th floor, which can be unlocked via a Baffle Board outside the building (you'll need to befriend an Illoo).
The Gold Card is acquired after completing "The Secret Base" quest that is activated by talking to Alex near the sewer entrance in Breezy Hills.
The Red Card is given to you by the leader of the Sesame Club in the sewers, whose members are scattered throughout the sewers. You'll need to speak with all 10 of them - if you approach them from the front of the doors they are guarding, they'll turn you away - utilize the various sewer entrances around Springdale to speak with them from behind their doors. Once you speak with all 10, speak with the leader to acquire the red card.
Once you have all three, you can use them at the main floodgate in the middle of the sewers. Once all three are used, Awevil will appear, where you can battle him once per day until he's befriended through normal methods.
Awevil can be freed from the Crank-a-kai with his own Boost coins, which can be found by reading QR codes, every time you don't free him, using one, the chance of getting him with the Boost Coin rises.
Awevil is obtained through the quest "Woe to Sleep Under the Ground", you need to beat the game and have the S rank watch to take the quest however. Upon taking it, Awevil can be found under a hidden manhole in Downtown Springdale, if you win against him he will be an auto-befriend.
Bomb (Puts a bomb down that will explode by time. Does massive damage)
Awevil's soul-Inspiriting accuracy up!
Befriended: "I can feel a dark power coming from you. I like it."
Receiving food (favorite): "Yesssss..."
Awevil, like Greesel, is based in the youkai Nurarihyon, said to be the leader of the Hyakki Yakou (Hundred Demon Night Parade). In the original tales, he is described as an old man with an elongated head, wearing fine clothes or the garbs of a head priest. He'll infiltrate mansions at dusk, while everyone is busy finishing up on chores for the day, and sit down in one of the rooms pretending to be the lord of the house: he will smoke the master's pipe, drink tea and sample the expensive food, bark orders at the servants and generally make himself at home. Sometimes he'll even dress up like a wealthy merchant and walk around town, or visit red light districts and mountain villas escorted by his youkai underlings. In Shigeru Mizuki's GeGeGe no Kitarou, Nurarihyon is one of the recurring antagonists of the series.