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First, let's start with the evidence outside of the manga itself. This one isn't very compelling, but it is cute. In Japan, there is a chip brand called Bakauke. Bakauke has two mascots known as Borin and Barin, who are girlfriend and boyfriend. When Bakauke collabed with Jujutsu Kaisen, Utahime and Gojo were chosen to represent the Borin and Barin respectively, thus being depicted as girlfriend and boyfriend.

Moving on to evidence found within the actual manga, we see that on the splash page for Gojo and Utahime, the print behind them depicts arrows known as a Yagasuri pattern. In Japan, this is a symbol often used for weddings. It's meant for good luck because "a shot arrow does not return," and therefore, a married woman does not (or should not) return to her parents.

We also see depictions of them under an umbrella often used at weddings. Sharing an umbrella is also a common romantic trope in Japan.

Other smaller evidence exists in the form of their phone call. This consists a beeper code, where the number of their call spells out "I like you" in code, and another interesting detail is that Satoru calls Utahime from his recent contacts, implying that he calls her often.

Gojo and Utahime were made to be opposites. Aside from the obvious "opposites attract" trope, it creates a compelling visual story between them. Man and woman, strong and weak, modern and traditional, blue and red. Satoru hates alcohol and loves sweets while Utahime loves alcohol but hates sweets.

Gege said Gojo only puts down his Technique with people he trusts, which we see him do with Utahime. He trusts her enough to have to actively put his Technique back in place after she throws a teacup at him.

Moving on to some of the strongest and most convincing evidence, we have Waka Inoue, Utahime's very own technique, and Gege's past works.

Gojo had a picture of Waka Inoue as his background as a teenager. He clearly finds her attractive, as is common, considering she's a popular model, but the reason why this is important is that Inoue shares a lot of similarities with Utahime.

Both women have noticeable bangs, they're the same height (166cm), and they share a love for alcohol, karaoke, and sports, specifically baseball. Waka is described once as a "competitive crybaby who hates to lose," and as we see in the Anime, Gojo has a way of firing Utahime up and she is also prone to being a bit of a scaredy-cat and a crybaby. We also see her more competitive side come out during the baseball tournament between Kyoto and Tokyo.

Moving on to Utahime's Cursed Technique, as some Japanese fans have pointed out, Utahime's Soro Soro Kinku (Solo Forbidden Area) is based on a real love song about forbidden love with lyrics about a masked lover. The records from the singer, Akina Nakamori, are called Utahime records, and the singer even does Gojo's unlimited void hand sign during her live performances of her song, "Fin."

The most compelling bit of evidence for me is Gege's past works. Two of his three one-shot manga have characters who are very similar to Gojo and Utahime. The male protagonist is usually cocky and teases the female protagonist, while the female protagonist gets annoyed at his antics but is otherwise down to earth and kind.

In Nikai Bongai Barabarujura, the protagonist, Noroma, reminds me of teen Gojo in appearance and behavior. He is "the strongest" who teases Nodoka, the female protagonist, for being weak but has an obvious respect for her drive and inner strength.

In Kamishiro Sosa, we have a similar set-up as before. The male protagonist, Ganji, is very energetic and careless with the female protagonist, Rekko's, feelings, and is seen to have a very similar type of banter as Gojo and Utahime have.

Gege clearly likes that type of pairing, which isn't surprising given the bickering couple and rivals to lovers is a popular trope in romance. It's not unusual for Mangaka to reuse old ideas, and that seems to be what happened with Gojo and Utahime. Even their appearances share similarities.

As you can see, GojoHime has a lot of thought put into it, and it's very interesting to see the little details Gege has put into their dynamic. There's definitely a reason why so many adore this pairing, and I'm glad Gege has paid attention to that.