Otto Suwen/Relationships

Oslo Suwen
Oslo is Otto's older brother. Although Oslo believes that Otto has the ability to be a merchant, he also believes that he is someone destined to get in trouble wherever he goes.

In the past, when Otto had still not developed the ability to speak and had hearing problems caused by his divine protection, Oslo noticed that written communication was possible and thus taught Otto how to write. In turn, Otto viewed Oslo in high regard, always asking for his advice before asking anyone else.

Regin Suwen
Regin is Otto's younger brother. Otto and Regin are shown to trust each other deeply. However, Regin often worries about his brother's wellbeing, believing him to be naturally unlucky, as do most of his family. Regin sees Otto as the person who inspired him to become a veterinarian, as Otto had a liking for animals.

In the past, Regin used to often demand Otto's attention, to which Otto reacted by indulging him. Ironically of the fact that the two trust each other, Regin was also the one who gave away the secret of Otto's blessing when they were children. This was when he once overheard him speaking with the Ground Dragon, Frufoo.

Otto is aware of Regin's feelings towards Marone, and is very supportive of their relationship.

Frufoo
Frufoo is Otto's ground dragon, and Otto has known her since his childhood. Otto has a great sense of connection with Frufoo, considering her a friend and a member of his family. Although she sees Otto as a troublesome person, Frufoo is completely loyal to him. When Otto was chased out of Picoutatte, Frufoo was sent with him, to accompany his journey's as a merchant and so she has been.

Furthermore, they often have conversations at ease, due to Otto's Divine Protection - making Frufoo a great companion to get advice from.

Natsuki Subaru
Despite seeing Subaru as a problematic person, Otto starts considering Subaru as his friend during the events that take place at the Sanctuary (Arc 4). Otto is willing to help him out whenever possible - even shown to get slightly infuriated when Subaru thought that he wouldn't understand his problems. Multiple times, Otto has sacrificed himself for his friends, and putting aside the fact that he claims he only looks at profit and losses, he cares for his friends and companions. This is demonstrated after freeing Subaru who was kidnapped by Garfiel in one loop, after which Otto consoles him and tells him he came to save him solely because he's his friend; even sacrificing his life to save the frozen-in-shock Subaru from Garfiel in the same loop. He consoles him yet again before and after Subaru's discussion with Roswaal. Then Otto put his life on the line once more during the battle against Garfiel in the Battle of the Lost Forest of Cremaldi all for his friend.

Marone Lisbon
Marone and Otto are friends as seen in their interactions in the Tapenshuu. Otto thinks of her as an admirably strong person.

Given that his younger brother, Regin has feelings for Marone, he has been kind hearted to her - only thinking of her as a friend and is willingly supporting of their relationship.

Emilia
Even before becoming an official member of the Emilia camp, Otto identified with Emilia's circumstances and decided to support her for the Royal Selection. As Otto also experienced similar matters in his childhood, he completely understands what she has had to put up with. The two currently have a friendly relationship. Otto often gives her advice, which Emilia appreciates. She thinks of Otto as a very dependable friend.

Garfiel Tinsel
When the two first met, Garfiel was hostile towards Otto, calling him names such as "third rate" because Garfiel didn't consider Otto's name worth remembering. During the battle of the lost woods of Cremaldi, Otto surprised Garfiel with his fighting capabilities, to which he apologizes saying he had underestimated him, but now understands he's serious. After the events of the fourth arc, Garfiel gradually took a liking to Otto, and the two currently have a brotherly relationship. Otto tends to unconsciously indulge Garfiel because of the similarities he sees between Garfiel and Regin in his younger years.

Frederica Baumann
Frederica and Otto have a friendly relationship. They consider each other highly reliable people and respect each other. And the two are shown to share their concerns about Garfiel as sibling figures.

Petra Leyte
Although Petra is often subtly harsh towards Otto, she recognizes his capabilities and does feel some respect for him. Petra has also referred to to him as "Ottottotto" in the non-canon Re:Zero Starting Break Time series - mocking his name in a childlike way. In turn, Otto treats her with gentleness and respect. Otto and Petra are the only people in Emilia's faction who are still wary of Roswaal, which creates a sense of trust between them.

Ram
Ram constantly teases or disregards Otto, but the two get along well. Otto also seems to enjoy her company from time to time; and Ram actually thinks of Otto as someone strong, in his own respective way.

Ricardo Welkin
Back when Otto was captured and taken prisoner by the Witch Cult, Ricardo was the one who saved him from certain death. After Otto finally grasped the situation, he almost started crying. Which is when Ricardo gave him a white handkerchief and turned around, walking out of the cave they were in, in order to give Otto some privacy - further telling him that men aren't to cry in front of people. Otto eventually started tearing up, drying his tears into the handkerchief as he was grateful for not losing his life. Due to that nice gesture, Otto feels somewhat indebted to Ricardo, swearing to himself that he'll one day repay the debt to him.

奥托·苏文/关系