One great 'gojo and utahime fanfic' is 'The Unlikely Bond'. It explores their relationship in a really interesting way, showing how they might interact beyond their usual roles. Another one could be 'Gojo and Utahime: A Different Perspective' which gives a fresh take on their characters and how they could be more than just colleagues.
Another one is 'Gojo and Megumi: Parallel Paths'. This fanfiction takes a different approach by showing how their individual paths, though different, keep intersecting. It focuses on how they influence each other's growth and decisions, with some great action scenes and emotional moments between them.
One great fanfiction is 'The Bond Beyond'. It delves deep into the complex relationship between Gojo Satoru and Geto Suguru. It shows their early days at Jujutsu Tech, their training together, and how their ideologies start to diverge. The author does an excellent job of portraying their individual personalities and the strong connection they once had.
It's hard to pinpoint exactly where Gojo is at any given time in the manga. His whereabouts change as the story progresses and different scenarios unfold. It could be in a supernatural realm, a mission site, or interacting with other characters.