Rom[]
Felt cares about Rom and treats him like her real grandfather. She greatly trusts Rom's word, especially when it comes to appraisals in price. Rom has looked after Felt from when she was an infant to now. While Felt was still in the slums, she did not want to burden Rom too much, so she became very independent. Felt enjoys having her head petted by Rom, finding it comforting.
Reinhard van Astrea[]
After the events of Arc 1, Reinhard took it upon himself to make Felt the 42nd King of the Dragon Kingdom of Lugunica. Ever since the Royal Selection Ceremony, the two of them are inseparable, partially due to the nature of their relationship - Reinhard being Felt's knight. The two of them engage in one-sided banter which often starts due to trivial reasons such as "Reinhard not being human" or "Reinhard being too perfect for a man". Naturally, Reinhard happens to be the one who the blame shifts onto. To an outsider, their relationship might appear as something rather novel and wholesome, however, even after having spent more than a year together, Felt still hates Reinhard, causing her to frequently lash out at him, as mentioned above. They're well-known throughout the Kingdom for having a very unorthodox relationship which breaks the bounds of normality, however, Felt doesn't consider the idea of "normalcy" as something one should bother with, hence she usually meets such observations with an air of hostility, which usually forces Reinhard to intervene and quickly resolve any potential disputes.
Despite such treatment, Reinhard displayed extreme devotion and affections towards his young mistress, always putting her before himself or anyone else. He disregards orders if they don't align with Felt's and is even prepared to forsake his duty as a knight, if the situation calls for it or if Felt is in danger. Sadly, this was sometimes used against him, as seen when his father Heinkel Astrea used Felt for his own advantage and forced Reinhard to guard him in order to make sure nothing bad happens to Felt.
Natsuki Subaru & Emilia[]
From Arc 5 onwards, Felt often refers to Subaru and Emilia as big brother (nii-chan) and big sister (nee-chan), reflecting Felt's deep appreciation for what they did for her and Rom in Arc 1.
Otto Suwen[]
At first, she would find Otto dubious because of his negotiations with Gluttony, but she would come to respect him when he set water dragons on the Sin Archbishop, and more so when he would be ready to lend his leadership to stop him. Otto, meanwhile, would come to respect her, even thinking that had he not been backing the Emilia Camp, he would consider joining hers.
Beatrice[]
Felt respects Subaru’s partner after she not only showed her knowledge of Echidna’s meteor staff, but also when she provided her assistance in defeating Gluttony.
Grimm Fauzen[]
A servant of the Astrea family who stops Felt from escaping. Felt notes that he is mute. He is "called" Gramps by Felt.
Carol Fauzen[]
A servant of the Astrea family who stops Felt from escaping. She also cooks tasty food. She feels that she can trust Reinhard to Felt, like how she entrusted Theresia to Wilhelm, due to Felt openly expressing her hatred and disgust towards Reinhard, to his face. She is called "Granny" by Felt. Felt likes Carol, and her husband Grimm, to enough of a degree that she wants to take them with her when she escapes the Astrea Manor.
Felt notes that she pictures Carol and Grimm as her ideal of what a happy marriage should be. Even as elderly servants, Felt notes that Carol and Grimm are very strong.
Louanna Astrea[]
Upon first meeting her, roughly a week after she was brought to one of the auxiliary Astrea Manor in the Royal Capital, Felt initially believed she was another woman Reinhard abducted, before being informed with Reinhard's connection with Louanna as son and mother. She openly expressed her thoughts about Louanna and how she thinks her hair is beautiful.
Heinkel Astrea[]
To say the least, they have a negative relationship caused by his unwanted presence in Priestella. When she would go to give the man a piece of her mind later that day, their relationship with further deteriorate when the man would take her hostage to force Reinhard’s hand. She would partly hand him a beating with Reinhard’s and Otto’s assistances. They have yet to meet again.
Anastasia Hoshin[]
After the Anastasia Camp inadvertently happened upon Mozolite and played a small part in resolving the incident in Flanders, Anastasia met with Felt, and the two decided to be friendly, finding a sense of camaraderie with each other. They maintain a positive relationship in Arc 5.
Russell Fellow[]
The two would meet after placing Wrath in the Prison Tower. When they had dinner later that night, though Russell would find her interactions with Reinhard odd and entertaining, he would be impressed with her mind and point of view. On the other hand, though she respects Russell’s occupation and mercantile mind, she would feel uncomfortable around him.
Lye Batenkaitos[]
The two would encounter each other in Priestella, where Lye would gain an interest in her and wish to devour her name. When he got the chance, however, he ended up feeling the kickback of his Authority, allowing Felt, along with Beatrice, to defeat him.
Rui Arneb[]
Shortly after defeating Lye, she would meet with Rui, who would be the one responsible for informing Felt that her name was not her original name. Unfortunately, Rui would escape, taking her brother with her, leaving Felt frustrated.
Sirius Romanée-Conti[]
Handling the duty of transporting the Sin Archbishop of Wrath, she would become familiar and frustrated with her demeanor over the course of the month of their trip to the Royal Capital. While Felt would often find herself annoyed with Wrath’s antics, Sirius would act overly familiar, completely unbothered by Felt’s attitude. Felt would remain unnerved by her, all the way up to their separation at the Prison Tower.