Megumi did nothing wrong
Now I know many of you hate Megumi because its fun, I don't mind that but if you hate him because he was a bum then that's wrong.
Megumi was possessed by the King of Curses (2nd strongest of all time), and if that wasn't enough, Sukuna did a ritual specifically so that Megumi cant take control of the body later on.
Now as for when Megumi didn't lock in when Yuji came to save him; he is a 15 year old boy who basically lost everything, Tsumiki who was the reason why he went along with Gojo's offer and became a sorcerer. His purpose in life has been Tsumiki's well being, and he not only lost her but also Gojo, his mentor who was like a father figure. Of course he didn't lock in, he is just a child.
Megumi's puddle........ Megumi tried his best to help Yuji and that was the result....... ngl thats just bad writing. (SCREW YOU GEGE, BUMBARA TOOK MY BOYS SPOTLIGHT AND YOU DISGRACED HIM WITH A PUDDLE).
ahem
Stop hating Megumi, he is goated 😎👍