She considers Kazuma a contradiction at times. She described him as someone who is idle when wealthy, yet hardworking when need of funds. A person who is perverted, but yet reliable during emergency situations. They enjoy a close relationship, with Megumin being the most emotional one in the party when Kazuma didn't want to return from the afterlife. She's also the most defensive in their party when Kazuma is badmouthed by strangers. Later on, she developed feelings for him, leading to a confession. However, Kazuma responded awkwardly and ended up with cold feet after fearing how it would change his relationship with the others.
They get along well enough to converse normally. She isn't easily annoyed by Aqua's stupid antics. When Kazuma stopped accompanying Megumin to cast Explosion at Dullahan's Castle, Aqua secretly went with her instead, suggesting a good bond between the two.
They get along well enough to converse normally. She isn't disgusted or bothered by Darkness' masochistic tendencies.
They share a sense of rivalry and seem hostile towards each other. While still in school, Megumin enjoyed bullying Yunyun. In truth, Megumin genuinely cares for her and secretly worries about others taking advantage of Yunyun's naive nature.
Yuiyui does what she thinks is "best" for her daughter. Once she found out that Kazuma is rich; she attempted to create a situation where Megumin sleeps with Kazuma to force an engagement. To this end, she locks Kazuma and Megumin in the same bedroom for several nights, and even knocks out her husband and Darkness with the Sleep spell to prevent them from interfering.
Arue has been a friend of Megumin and Yunyun since their school days, where she ranked just behind the duo. She was the one who gifted Megumin her eyepatch, though only because it was her old one that was beginning to wear out.