Maybe the friend is the reincarnation of the og Lloyd?
Ideally that would be cute, but it would also confuse things. The world is in a novel so it's in the past. Destined to occur, obviously that's why suho knows what was going to occur because he read the events in the future, Seoul. However Gogi being the reincarnated og Lloyd means that all the events in the manga were destined to happen creating a loop in which suho grows up in the future but joins the past to make the future what it is, Gogi existing. It would also mean that it would be written in the manga, which it wasn't. Because suhos arrival in the novel is supposed to be an error. Gogi being the reincarnated Lloyd would make things so confusing. Either Gogis soul would be replaced (which doesn't make sense) or it's the actual og og Lloyd that we didn't see get reincarnated, the one that was written in the novel and killed by Javier (which also doesn't make sense because the reincarnated og Lloyd had character growth through watching someone replace his body).
I think his friend is the reincarnation of the real Lloyd
Nah they said in the story that after hell he reincarnated in that world so he is probably a child at this point