AoIno

AoIno is the het ship between Inosuke Hashibira and Aoi Kanzaki from the Demon Slayer fandom.

Canon
Inosuke and Aoi first met when Tanjiro, Zenitsu, Nezuko, and Inosuke came to the Butterfly Estate due to injuries after the fight on Mount Natagumo. They train together for a period of time before both Inosuke and Zenitsu decide to quit.

Following the battle at the Red-Light District (Red-Light District/Entertainment District Arc), Aoi cries as she tells awakened Tanjiro that Inosuke was in terrible condition because Gyutaro's poison caused him to bleed a lot more. Inosuke then appears on the ceiling over Tanjiro and lands on his bed, gloating about his strength. After, Inosuke is stunned when Kiyo tells him is like a Honey Badger who has hide like armor and is immune to poison. Aoi grabs onto Inosuke, telling him to get off Tanjiro. Inosuke is suddenly convinced he is invincible and Gotou tells him he is just a moron. He goes to attack Gotou, but Aoi grabs onto his waist, calling him a moron and an ass. She proceeds to tell him that while he has poison resistance, he also resists the medicine she gives him. She remarks on his terrible memory, saying he forgets everything. They bicker back and forth, Inosuke calling her a pipsqueak, and Aoi retaliating, saying they're almost the same height. She yells at him to be quiet so Tanjiro can rest. One potential moment was when Aoi was scolding Inosuke for stealing food and giving him his own tray of food so he doesn't steal anymore, followed by Inosuke smiling and a slight blush on his face.

In the end of chapter 205, Aoba Hashibira makes an appearance. He is Inosuke's descendant, and is predicted to be Aoi's descendant as well, but it has not been confirmed. However, there are several hints that imply that he is also Aoi's descendant: he has black hair without faded blue tips, he works in a field of scientific study, and his name Aoba is similar to Aoi in romaji spelling. There is also the fact that Aoi did not reincarnate like the main characters who all had descendants.

Fanon
The ship most likely started when Inosuke showed no restraint against her in the full-body training and when Aoi was weeping while explaining Inosuke's injuries after the fight against Upper Moon 6. They do not seem to have any interactions throughout the series, but their similar personalities are what dragged the fandom into shipping them. The banter that comes from their canon interactions is carried over into fanon.

Their dynamic is such that while Inosuke is relatively insensitive, Aoi is able to put up with him and his shenanigans, not afraid to give him a piece of her mind as well. Inosuke is also prone to danger and attracted to risk-taking while Aoi is a medic and acts as a den-mother. He lacks that kind of care, so Aoi worrying over and caring for him is something he might pay close attention to. The fandom commonly portrays Inosuke as liking Aoi's concern deep down, enjoying that someone actually does care/worry about him besides Tanjiro and Zenitsu.

Another common Fanon depiction is Inosuke being sweet and kind in his own brash way towards Aoi, who he views as strong and tough. Though he might not be the best at expressing his feelings, he would be good to her, and protective too. She would understand his displays of affection and particular mannerisms, and have no problem putting up with them. Additionally, Aoi is a fantastic cook, and Inosuke loves to eat. Fanon loves to interpret this dynamic as Inosuke pining after her delicious food (chapter 204 reflects this).

Though it is not a high-ranking ship in terms of fanfiction, the fandom's love for them shines through fan art, and it is one of the most well-known Inosuke ships.

Fandom
FANART
 * 伊アオ on Twitter
 * 伊アオ on Instagram
 * 伊アオ on Pixiv

FAN FICTION
 * Inosuke/Aoi tag on AO3
 * Inosuke/Aoi on FanFiction.Net