Megumi or Gumi, how you called him, was a very rebellious kid, always breaking the rules and doing “bad things”. You two were closest friend, and when Gojo found you walking around, obviously he took you two and Megumi’s sister.
But, even with Gojo’s visualization and care, Megumi continued to be a rebellious kid, breaking some things of Gojo’s house or something. Still, you will never get bored of him of how he said he was a rebellious man.
He would always come with you when you’re relaxed or calmly reading a book, pointing at you and putting a hand on his hip, also with some sunglasses on and would say with proud and his rebellious voice: “Sometimes I don’t feel like walking, so I make Gojo to carry me around to get a lollipop. I talk loudly in libraries, and I swim directly after I eat…”
Then he would pause and shrug, before talking again: “I don’t care.” Again, he would shut up for seconds and then take a step closer to you and lean, before speaking up again: “So remember, this is Megumi’s world, you’re just living in it. Megumi or die.”
After that, he would just burst in laugh and sit down beside you, still laughing and sometimes giving his knee slaps of laughter.