The Father Spider Demon is the physically largest of his "Family", his skins is dark brown with the same red dot like design extending from his shoulders reaching down to his arms, like his "Wife" and his "Children" the Father spider demon also has long pale white hair reaching down across his shoulders with his only unique trait being that his face resembles that of a gigantic spider with several eyes and spider pincers in both of his cheeks.
When he molts he gains green skin with blade like protrusions sticking out of his arms and legs. He loses all his hair and gains sharper teeth and more pronounced mandibles. He also gains five spikes going upwards on his forehead.
The Father Spider demon seems to be the most devoted to his family, as when he battled Tanjiro and Inosuke he repeatedly told them to stay away from his family while attempting to kill the duo and seemed to be the most devoted to the role of "Father" in Rui's fake family. However he was also shown to be quite abusive towards his "Wife" having repeatedly slashes and physically abused her in the past without even stating his reasons for doing so due to her being weaker than to what they originally expected of her.
After the Older Sister Spider Demon called for him, the Father Spider Demon landed in front of Kamado Tanjirou and Hashibira Inosuke. He angrily told them to get away from his family, attacking them with a fierce punch. He easily blocked Tanjirou's Water Wheel technique, attempting to counter with another punch, only to be thwarted by Inosuke's twin swords pinning his arms down. He threw the two Demon Hunters off of him, immediately charging and attacking Tanjirou while repeating his earlier demand. Inosuke attempted to attack him from behind, only to be immediately punched. The Spider Demon attempted to continue his assault on the pig-headed Demon Hunter, only to be pinned by a tree that Tanjirou had cut. He quickly recovered from this, using the unexpected object to smash his assailant into the distance.
Later, while Inosuke contemplated his next move, the Father Demon attacked him, breaking the tree he was leaning against. Surprised by his opponent's quick retreat into attack, the paternal Demon blocks the strike, but has his forearm severed when Inosuke uses both of his blades. Briefly examining his stump, the Father Demon then retreated, climbed up a tree, shed his skin, and assumed a new form. He then descended the tree, ready to resume the battle.
Towering over his astounded opponent, the Father Demon punched him with great force, following through almost immediately with another blow, which the Demon Hunter avoided by jumping into the air. Inosuke attempted to sever the paternal Spider Demon's neck with his Rip and Devour technique, only for his blades to shatter upon contact. The Father Demon immediately counterattacked, sending his adversary hurtling into yet another tree, and then picked the Demon Hunter up by the throat. Readying another punch while simultaneously throttling his opponent, the Father Demon once again repeated his earlier demand, only to be stabbed in the throat by his resilient adversary. Unfazed, he tightened his grip on the youth's throat, but had his forearm severed once more, this time by the newly arrived Tomioka Giyuu. Howling in pain, the Father Demon immediately regrew it, charging at the Pillar. His offense and existence were soon erased as the veteran Demon Hunter struck him with his Striking Tide attack, severing his neck and cutting him to pieces.
Abilities and Powers
As a demon he possess superhuman physical strength,reflexes and senses and out of all of his "family" he seems to have the most physical strength out of them,as noted by Tanjiro the Fathers skin is incredibly tough and durable that despite using multiple Breath of Water style's to attack him Tanjiro could only barely pierce his flesh.
Blood Demon Arts
- Metamorphosis - The Spider Demon possess the ability to shed his outer skin in order to transform into a more powerfully form with increases physical power and regenerative abilities with this form being even stronger and durable that his original form.