KakaGojo

 is the slash ship between Kakashi Hatake and Satoru Gojo from the Naruto and Jujutsu Kaisen fandoms.

Canon
As they come from two different series, Kakashi and Gojo have never met in canon. However, they share many similarities.

They share many similarities when it comes to their appearances. Kakashi has gray hair and Gojo has white hair that can appear to be grayish. They both have special eyes that they hide behind a black blindfold, or a forehead protector in Kakashi's case, Kakashi has the Mangekyō Sharingan and Gojo has the Six Eyes or Rikugan. When wearing a blindfold, both of their hair is spiky and stands upwards but when they're not wearing it, their hair appears to be softer. Kakashi and Gojo are both tall, Kakashi is 181 cm (5'9) and Gojo is at least 190 cm (6'2). Kakashi and Gojo are both lanky, although in Gojo's case, it is only true for the anime. They also wear uniforms, Kakashi wears the standard Jonin uniform and Gojo wears Jujutsu High's uniform.

They also share many similarities when it comes to their personalities. They are both very intelligent genuises as Kakashi became a genin at age 5 and Gojo is stated to be able to do anything he tries and was already part of the strongest duo at age 16. They also very good at coming up with strategies on the fly. They have both the ability to be serious and unserious depending on the situation. They both lost their best friend (who became villains) at a young age which greatly impacted their outlook on life. They are both solitary people because the experiences they had.

They also share similarities when it comes to their narrative roles. Both are powerful sensei of a trio of teenagers. They both teached students who has other mentors: Kakashi's three students had the Sannins, Naruto has has the toads of Mount Myōboku Killer Bee. In Gojo's case Yuji had Nanami, Todo and Kusakabe, Yuta had Miguel and Maki had Daido and Miyo. Both are well known in their world: Kakashi as the Copy Ninja or Kakashi of the Sharingan and Gojo as the strongest sorcerer. They are both the highest rank they can be, Kakashi as a jonin and later as the Hokage and Gojo as a special grade sorcerer. They have both used their political power to save their students, Kakashi to pardon Sasuke from his crimes and Gojo to save Yuta and Yuji from execution. Their pasts/backstories were very impacful in their respective stories as a whole. They both died, although, in Kakashi's case it wasn't permanent.

They also share similarities when it comes to their powers. Both have occular powers that are hereditary and can't be deactivated. Kakashi has the Kekkei Genkai of the uchiha clan, the Sharigan, and Gojo has the Six Eyes. Both have to cover their eyes because it tires them out otherwise. Both of their eyes gives them extraordinary perception as the Sharigan allows the user to see chakra and it grants them incredible clarity of perception. The Six Eyes allows Gojo to see the flow of cursed energy in great details, the ability to use that flow to read cursed techniques and it alows the user to have ultra-precise control over the their own cursed energy.

They both have spacial abilities: Kakashi with Kamui which allows him to send object to a separate dimension and Gojo with the Limitless Technique which allows him to manipulate space on an atomic level. When Obito channelled both his eyes' dōjutsu power into Kakashi, he was able to become untouchable, which is Gojo's most known ability but these two abilities function very differently. Kakashi's Susanoo gave him great defense and Gojo is well known for his great defense.

Fanon
has 32 fanfictions written under its tag on Archive of our Own. It is Kakashi's second most popular crossover ship behind his ship with Harry Potter. It is also Gojo's most popular crossover ship, more popular than GojoKima, on the website. Fans like to ship these two characters together because on the surface, personality and design wise, they are very similar. They are also some of the most popular and beloved characters in their respective series. They sometimes appear in fanart with other mentors like Shota Aizawa from My Hero Academia or Kisuke Urahara from Bleach.

Fandom
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Trivia

 * Despite popular belief, Gojo's design was not inspired by Kakashi but by Tobitake Tonbo, a minor character from Naruto, as he wore white bandages in his first appearance in Tokyo Metropolitan Curse Technical School.
 * Kakashi dislikes anything sweet while Gojo loves anything sweet.
 * In two volume extras, Gojo is shown wearing both a blindfold and a mask, making him look similar to Kakashi.