Rem/Relationships

Ram
Throughout their childhood, Ram had always been superior to her in every way. Growing up in her sister's shadow, Rem greatly admired her older sister, but also had some lingering resentment and feelings of self-inferiority. However, that resentment turned into guilt after Ram lost her horn. Even afterwards, Rem still believes that her sister is much greater than what she can ever achieve.

In general, Rem and Ram are as close as expected from the twins. For example, although they have quite different personalities, the sisters easily understand each other and even instinctively synchronize their thoughts or actions, if necessary. This is particularly noticeable on Rem's part, who has a platonic sister complex towards Ram and is even openly jealous of her to Subaru when she thinks they are in love with each other.

Roswaal L Mathers
Roswaal took Rem and Ram under his wing and is shown to deeply care for them, as seen when Rem died of unknown causes and he immediately suspected Subaru for her death (he was even prepared to kill him, much like Ram). Due to Lye Batenkaitos eating her name and memories and leaving her in a comatose state, Roswaal no longer remembers her, though he does allow Subaru to let her stay in the mansion.

Emilia
Rem submits to Emilia as one of the maids of the Roswaal manor, and always refers to Emilia with the prefix -sama. They have rarely interacted with each other but Emilia has shown her caring nature for Rem by hugging her while they were drunk. Following the events of arc 2, Rem began to be more open to Emilia and others as well. Rem was also aware of the feelings that Subaru harbored for Emilia and even mentioned to Subaru about his date with Emilia in Memory Snow OVA. During the events of arc 3, she also denied to run away with Subaru when he was in a state of depression because she knew that the Subaru she knows wouldn't abandon Emilia. She finds herself conflicted with Emilia when it comes to Subaru as she develops affection for him, sometimes feeling jealous but also finding his antics around Emilia cute.

Crusch Karsten
Rem sees Crusch in a very positive light, as she is always valiant and composed. In Rem's eyes, Crusch is an ideal image of womanhood, though not as ideal as Ram.