The following is a description of Killa's relationships and interactions with other characters in Monster Musume: Everyday Life with Monster Girls.
Humans[]
Kimihito Kurusu[]
Killa tries to stab Kimihito.
Kimihito and Killa got of to a very hostile start as Killa tried to attack him to get revenge on Rachnera. This forced Kimihito and Centorea to incapacitate Killa by trapping her in a sauna. Due to his friendly character, however, Kimihito did not show any open hostility towards Killa and even gave her some water during the survey to make her feel a little better. As thanks to him, Killa told him about the other dangerous Liminals that had come into the country illegally with her.
Mr. President[]
Mr. President is the smuggler who illegally smuggled Killa into Japan because he considered the poison of the Killer Bee to be a valuable raw material. As seen in Chapter 53, Killa is also delivering samples of her poison to pay for her immigration expenses.
Kimihito's homestay girls[]
Centorea Shianus[]
Since Killa tried to attack Kimihito, Centorea regards her as an enemy and even after questioning she warned the Killer Bee that she should not try to harm her master a second time. However, due to her own dislike for Rachnera, Centorea said that she would not care if Killa continued to seek revenge on Rachnera, although she later agreed to Kimihito that Killa's deportation was her own fault when Killa told her about the incident.
Rachnera Arachnera[]
Because of the incident that led to Killa's deportation, she hates Rachnera and tries to get revenge on her. Basically, however, Killa's hate can be regarded as nonsensical, as it was mainly her own behaviour and her stupidity that led to her deportation.
Others[]
Kino & Curie[]
Killa travelled to japan with Kino und Curie, but she was of the opinion that the two were "seriously bad" and that she would try not to meet them again.