Sakamaki Izayoi/Relationships

Black Rabbit
On the surface, he teases Black Rabbit quite often for his own amusement, a fact which exasperates the latter. However, they share a close relationship despite that fact; Black Rabbit respects Izayoi for the amount of achievements he has made towards the community and his natural talents, both physical and mental, while Izayoi, as mentioned above, once went mad with rage upon seeing Black Rabbit beaten up by HIs Highness, a testament to how much he cares for her.

Kudou Asuka
It is shown that he and Asuka had bad impressions of each other when they first met, but later became friends. In Episode 6, he saved Asuka when they were escaping from an angry Black Rabbit who was riled from a prank they pulled for fun. As the anime goes on, Asuka starts respecting him more for his knowledge and ability. They are friends and the main force for their community.

Kasukabe Yō
During the period when You was bedridden due to the Black Death infection, Izayoi had sat beside her bed reading nonchalantly and claiming that he was doing so just to have a private space in the quarantine room. He also forgave her readily when she told him that she had damaged his headphones beyond repair. He pretended not to know that Calico was the one who had stolen his headphones and gave up on his chance to participate in the Harvest Festival opening ceremony. She believes in his strength as she stopped Asuka from using her full powers upon seeing Izayoi's arrival during the Ouroboros alliance`s first attack on Kouen city. They are friends and the main force for their community.

Shiroyasha
She is one of the few people Izayoi seems to hold some respect for. He was willing to give up on a duel against her and decided to allow her to "test" him during his first meeting with her. Later on, Izayoi often goes to her for advice on various matters, and it is believable that they share a relationship akin to that of close friends. It's unclear whether Izayoi respects Shiroyasha because of her strength and power or her perverted nature that they both share.

Jin Russell
Izayoi's good qualities rub onto Jin. He seems to look up to Izayoi very much, listening to him and trying to keep up with him. In turn, Izayoi helps out with the planning of the Community's future such as helping to suggest plans that would guide the Community to gain more potential allies and build its reputation. They also spend much time in the library together, in the No Name Community grounds, researching on ways to get their lost comrades back.

Leticia Draculea
Leticia was first one to ask him about his past and probably knows the most about him in the community. She was surprised when she heard of his foster mother's name, Canaria, who was an important figure in the Community before it fell to Ouroboro's attack. After Izayoi defeated her in the battle of the huge Dragon, she officially becomes the chief maid of the Community and refers to him and the other problem kids as her masters.

Percher
Participates actively in Izayoi's plans that include lots of fun. This is shown when she is seen battling Asuka to make her see the difference in powers, or even purposefully ticking off the assembled group of demons and beasts during the conference to fight against Ouroboros. Though when she goes too far in her pranks, Izayoi would rein her in with threats that make her tremble all over just at the thought of it.

Shirayuki-hime
The snake water god that he challenged on his first day and obtained the water sapling from. She then invites him for a game in her territory once more when Shiroyasha asks her to. They played hundreds of games with each other all of which she lost to him and finally becomes the third maid of the Community due to the uncompleted repairs of her temple being delayed.

Baron La Croix
He helped Izayoi choose whether to stay in his world or leave to save the little garden.