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For Sonia, it is a necessity to conduct herself as a princess, even if she also wishes to be her own person. In chapter four Hinata even remarks that he hasn't seen her emotions waver in the slightest and in response she asks him if he thinks of her as a "cold woman". Instead, she tries to remain optimistic and upbeat. This shows that her responses even in life or death situations may seem unnatural, but to her it is just a necessity. She believes that human destiny is already tied, so if she were to die in the mutual killing school trip, it would be for the purpose of her country. Her country comes first and foremost, but by the end, her friends are very close to that level. Despite these beliefs, however, there are times when her real feelings show through. In her fifth free time event with Hinata, he noticed her hands were shaking. Then finally in her sixth free time event he notices that she isn't being her usual self because he's more used to her behaviour. She finally breaks down and cries on him, yelling that she just wants to go home to her family and people. She stops trying so hard because it finally feels like she can be a normal person and rely on a friend as they've finally had the time to get to know each other.

Image, for all intents and purposes, causes Sonia to be afraid to let people know about her own desires and passions in life, such as Freemasonry, which is forbidden to her. She mentions that she's never had a friend her age that is equal in status, so coming to Japan to Hope's Peak Academy was like a dream. She had hoped to live as a normal, regular girl. Unfortunately, though, she still feels constrained by her position as a princess, and is unable to relax and be herself. She tells Hinata: "But in the end, no matter where I go...I am nothing but a princess." This doesn't only concern her emotions, either. After staying up all night worrying about Fuyuhiko after he is injured, she tells Hinata that her face looks terrible and that she must re-wash it in the hope that she improves her appearance. The whole thing is ridiculous and probably due to pressure of looking good at all times as Hinata states he honestly thinks she just looks the same as normal.

One of the reasons she chose Japan as a destination for her studies is due to Japanese Dramas, to which she has almost an unhealthy obsession. She excitedly tells Hinata about all the cliche stories and plots and can even say the relevance of the drama to its point in time. It's likely she's had a very lonely life and has probably watched countless of Japanese Dramas, read books to study and to learn about occults, cults and different cultures to entertain herself.

Even though Sonia is well read and has a high academic level, she has been incredibly sheltered. In her free time event she tells Hinata that it took her a while to understand how to use the shower, even admitting she hadn't realised you have to turn it off once you're finished. She accidentally flooded her bathroom because of this, which shows how taken care of she had been back in Novoselic Kingdom. She probably had a maid who would tend to her every need because she hadn't known how to set up her own bathing area, said she had never cleaned and often remarks on other things that would be deemed "common" by a normal person.

She often misunderstands what people say due to her being from a different place. It can make her seem gullible, especially at the start when Teruteru would make obscene comments that she didn't quite understand. Alongside this, she also frequently uses slang she's heard, though it isn't always accurate. This includes calling her femininity "hella boss", using "fo' sho" and even using a metaphor that really never made any sense when following Hinata's claims he didn't understand why she was asking him if he knew about occults: "You are hopeless... Since I have already sailed this far, I shall sink you into the ocean.". She does this because she wants to fit in and seem normal and they are things she's probably heard in dramas. On the other hand, it is because of her translating information about "Jabberwock Island" and noting that there had been a huge Administration building in Jabberwock Park that they come to realise the islands are strange.

Of course her culture also helps shape her personality. A tradition her country apparently has is that to be considered an adult, they must consume a Skong--another type of animal from her Kingdom. Sonia, however, is too good natured and worries about the long term effects such a ritual will have on these animals. She tells Hinata that when she is Queen, she will banish this tradition and try to harness their energy instead.

In the game, Hinata isn't the only person she is close to. Later in the game she is often said to have left with Gundham Tanaka to go exploring. She has a great interest in what he has to say due to his links with the occult. She also takes great pleasure in seeing his four hamsters, and after his death the producer said she adopted them to ensure they were cared for. If anyone says a bad word about Gundham, she immediately steps in to shut them down. At one point, he also refers to her as "Dark Queen" and even says that there's a dark power sleeping within her. Additionally, when Gundham is found guilty, Sonia begs Monokuma to spare his life. Gundham tells her that her reaction isn't fitting of her status which makes her quieten, but it's obvious that his conviction truly upsets her.

In comparison to how Sonia acts with Gundham, she treats Kazuichi Souda coldly. This is because she sees him as a creep who won't leave her alone. Souda constantly offers to do anything for her and she has sometimes used that to her advantage, but for the most part she tries to ignore him, even asking him if he said something after he tried to deliver an uplifting pep talk to the group. Sonia also arranges a get together at the beach for the girls before it ends up cancelled due to Koizumi's murder. She tries to help Hiyoko when she struggles with her obi after Koizumi's death by telling her to try using a full length mirror. While she might not have been as supportive as Koizumi who stuck up for both Mikan and Hiyoko, she would not say bad words either. She also wonders about the way they treat Nagito Komaeda when the others insist on trying to capture him before he does anything bad again. In Sonia's opinion, war or fights do not solve anything, she'd much rather try and solve issues diplomatically. In fact, it may be that she had been right and that them trying to trick Nagito made the situation worse overall.

Furthermore, her loyalty is unshakable. Despite the murders actually happening, Sonia insists it's hard to believe that any of their friends could do something so grave. Over and over, when they're forced to take more trials, she insists that she's tired of doubting everyone when she desperately wants to believe in them. In chapter five when Chiaki Nanami is finally revealed as the "traitor", Sonia insists that she forgives her and that no matter what they are still friends.

Not all is sunshine and daisies, however, as the group learned that they had in fact been part of the group Ultimate Despairs who were responsible for destroying most of the world. After learning that they're currently in a program meant to amend their memories to before Junko Enoshima brainwashed them, Sonia is distraught that it would have all been for nothing. Leaving the program gave them very little chance that they'd remember the events in game, and instead would wake up as their old selves--still Ultimate Despairs. She, alongside Hinata and the others left standing, regain courage to do the right thing, and hope that when they awaken all of this won't be in vain. In fact, it actually ends with them deciding to stay on the island to help their friends who stay comatose after being killed in the "game" world. Despite everything they've been through, it's proof that they really did grow as people, and there is a chance that they are on their way to recovery - as a group, and as individuals as well.

As an "Ultimate Princess", Sonia was chosen by Hope's Peak Academy for her skills that make her a great Princess for the Kingdom of Novoselic. She thinks highly of her people and the actions she must take to lead them down the "right" path. In terms of game play, maxing out her "hope fragments" gives Hinata the Maximum Influence Gauge which links to how her presence helps the others in game too. A smile from her usually has helped the others calm down just as much as her yelling at them to calm down. In fact, in Chapter 1 when Togami says he will take the leadership role, Mahiru tries talking Sonia into contesting the position.

On top of this, she often uses a voice that makes others want to follow her or even bow down before her. Of course, this doesn't work on everyone or wouldn't in game!

She's good at hiding her emotions. In the game Hinata remarks that he hasn't seen her waver once despite the deaths they've seen. She tells him that it's her duty as a princess to never waver, so less her citizens fall to despair.

She speaks 30 languages, has a high level of knowledge regarding international law, politics, diagnostic medicine (basically everything needed to be a great ruler) and even states in Novoselic they are taught how to use a tank in Elementary School. It seems as though she's been taught a fair deal about weaponry, actually, because she says the weapons may come in handy if it were necessary to fight the Future Foundation. It's why she was able to work out that the "bombs" present in the game were actually fakes, too.

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