Emi Yusa[]
Upon their initial encounter, Suzuno and Emi misunderstood each other. Emi had thought that Suzuno, like Chiho, had romantic feelings for Maou and had indirectly informed her about Maou's dark past. In actuality, Suzuno was spying on Maou, thus forcing her to spend time at his home. After getting on the same page with each other, Suzuno and Emi both team up with the focus of bringing the devil down. They eventually develop a close bond and later become great friends to the where they are willing to die to protect one another. It can be noted that their takes on justice contrasts greatly. While Emi believes taking lives is cruel and unjust, Suzuno believes it is necessary and usually unavoidable.
Sadao Maou[]
Suzuno introducing herself to Maou
Suzuno was initially meant to spy and assassinate the Demon King under the orders of the Church. However, having spent time with his entourage and ultimately being saved by him, she realizes that Sadao is no longer the villain he once was since living on Earth and becomes a trustworthy ally and friend. She begins to question what she had been told about the Demon King in Ente Isla as she becomes increasingly convinced that the persona she sees in Japan is his true personality. This feeling slowly increases after she chooses to side with the Demons and Emi against Sariel, where she asks Alciel why the Demons had attacked Ente Isla and is given a metaphoric answer regarding the poor living conditions in the Demon Realm. Maou later appoints her, Chiho, and Emi as Demon Generals to replace the two who were killed during the invasion of Ente Isla. In the 9th volume of the light novel, while traveling together on Ente Isla to save Emi, she takes his confession and learns the truth behind the invasion; with demons feeding on negative emotions and Maou's unification of the demon realm having removed them, the entire demon race would inevitably become extinct unless they found a new source of sustenance. She then realizes not only is Maou a truly good person and would be a just King, but she also has unrequited feelings for him. She ultimately decides to keep this from him, to not get in the way of her friend Chiho's feelings.
As one of the new Demon Generals, she uses her position to deliver an order from Maou to the Malebranche and Farferello to stand down and return to their previous positions, with their actions being overlooked by Maou.
Shirō Ashiya[]
Hanzō Urushihara[]
Chiho Sasaki[]
As an inhabitant of the Earth, Suzuno initially saw Chiho as someone who should have her memories involving Ente Isla erased. However, after spending time with the human girl, she views her as an essential friend.