Obanai Iguro/Relationships

Mitsuri Kanroji
Obanai is deeply in love with Mitsuri, but pride, nervousness and the fact that he feels he is not worthy of her due to his "filthy blood" keep him from being forthright. He gives her gifts, keeps correspondence through letters, and is protective of her, and, while she enjoys the attention he gives her, she seems oblivious to his feelings but it is revealed that she also likes him. After the battle with Muzan, Obanai is seen cradling Mitsuri's body but, although both are still alive, they already felt that they were going to die soon. Obanai reminisces about the first time they met at Ubayashiki's mansion and how Mitsuri saved him by making him feel like a normal young man and how he won't let anyone say anything bad about her. In the end Mitsuri confesses that she likes him and that the meals she ate with him were the best. She also states that he has always been looking at her so gently and asks him that if ever they will be reborn as humans, if he could taker her as his wife. Obanai replies that if she's okay with him being her husband then he'll definitely make her happy and that, next time, he won't let her die.

Giyu Tomioka
Obanai hates Giyu for unclear reasons, though Obanai's temper may be a large factor in it.

Tanjiro Kamado
Obanai also hates Tanjiro with a passion, even more than he hates Giyu. It started with Tanjiro's breach of Demon Slayer conduct and insubordination during the Pillars meeting, but intensified after Tanjiro interacted with Mitsuri during the Swordsmith Village attack and completed her Pillar Training with raving reviews. As the story goes on, Obanai shows something of warmth towards Tanjiro. An example is when Tanjiro gets slashed in the eye by Muzan, and Obanai jumps in to protect him. They also work together to fight against Muzan when Obanai loses his eyesight due to an injury, Tanjiro gives Kaburamaru one of Yushiro's seals that allows Obanai to see what his snake sees, aiding in the battle.

Kyojuro Rengoku
Obanai seemed to deeply respect Kyojuro and held him in a high standard. He believed he was extremely powerful, expressing his disbelief when he died.

Tengen Uzui
Despite Tengen's victory against Upper Moon Six, Obanai downplays this significant achievement to instead emphasize the extent of his injuries. Tengen, for his part, brushes aside Obanai's concerns, insisting on retiring and disagreeing with the latter's sentiment that the Demon Slayers were going into decline.