Aizetsu's info

 Source: https://kimetsu-no-yaiba.fandom.com/wiki/Hantengu#Aizetsu_

Appearance

Aizetsu is a tall and muscular young man with shoulder-length hair and narrow, deep blue eyes with the kanji 'Upper Rank 4' engraved into them. He has two prominent curved horns on his forehead and cracked markings under his eyes. As a demon, he has pointed ears and sharp nails on each finger. He is usually seen wearing a dejected expression on his face. He wears a black kimono with white lines running through various areas of the clothing and rope-like accessories tied around his shoulder.  He also wears hakama pants and a pair of zōri. Aizetsu is always seen carrying around a Jūmonji Yari.

Personality

As the manifestation of Hantengu's sorrow, Aizetsu was portrayed to be completely dejected, sour, and negative, constantly describing everything as depressing. Out of all the manifestations, he was shown to be the calmest and most collected out of all five of them, as seen when instead of frivolously wasting time on entertainment as Urogi and Karaku or immediately getting agitated and enraged by anything like Sekido, Aizetsu was shown to calmly analyze his opponents and think out his strategy and figure out his opponents' abilities and weaknesses before attacking. His perpetual dour and sadness even extends towards his fellow demons, as seen when he complies with Sekido's orders to make him stop yelling.

Abilities

1.Flesh Manipulation: Like all demons, Aizetsu possesses the ability to control and alter his flesh to a certain extent. He uses this ability to shape his flesh into a Jūmonji Yari.

2.Unlimited Stamina & Endurance: Like all demons, Aizetsu possesses infinite stamina and endurance. This was shown when he was able to engage in battle with Genya for an extended period of time without showing any signs of fatigue in the slightest. He was also completely nonchalant when Genya destroyed his neck with a shotgun that fired Nichirin steel shot, even managing to attack without his head intact and heal his neck with ease.

Fighting styles

Spear Projection: Aizetsu's Blood Demon Art allows him to project the thrusting attack of his Yari over great distances, allowing him to attack his targets from afar. Additionally, its potency has been shown to be enhanced, as Genya, in his attempt to shield Tanjiro, was left with numerous puncture wounds all over his body.

Equipment

Jūmonji Yari: Aizetsu wields a Jūmonji Yari fashioned from his flesh and blood. It serves as his main tool in combat, being used to unleash close to mid-ranged thrusting or slicing attacks as well as allowing him to block and parry attacks from his opponents. His Blood Demon Art works in conjunction with his Yari, allowing him to project and lengthen the spear's attacks to strike his targets from afar.