One Piece fans have been coming up with theories regarding the Elbaph arc and who is Loki's mysterious friend, Mosa, especially considering that they haven't been able to see what the latter even looks like. However, X user named @BlacktyonteXavi has come up with the theory that he could be Heracles, the man who trained Usopp during the time-skip.
One element of this theory in One Piece is how Mosa's name is connected to plants, which is the basis of Heracles' character when he meets Usopp. Moreover, his name being that of a demigod, thus taking from mythology much like Loki, could add to this discussion, especially considering how Heracles seems to exist in a vacuum within the story.
Disclaimer: This article is a speculative theory and reflects the writer's opinion.
Explaining why Mosa could be Heracles in One Piece
There have been many theories regarding who Mosa is, the mysterious friend of Loki's who talks to him through a Den Den Mushi. It is difficult to predict what author Eiichiro Oda will do with this character, but there is a new theory that it could be Heracles, the man who met Usopp back during the days of the time-skip and the one who taught him how to use his plants in combat.
While this is definitely something that could come out of left field, it is worth pointing out that Mosa's name is associated with plans, which, as mentioned earlier, connects with Heracles. Moreover, the fact that both Heracles and Loki take names from mythology could play a role in this discussion, especially considering how much the latter takes from Marvel Comics' version of Thor, who has Hercules/Heracles as a rival.
Many people have mentioned that Elbaph might be Usopp's arc because of his devotion to the Giants, and this could be another way to make a connection. After all, the character of Heracles seems to exist in a vacuum, and his existence without context doesn't make much sense in the narrative, so this could give him a better role.
The role of Usopp in the story

There is no denying that, by the time the Elbaph arc rolled around, many One Piece fans were expecting author Eiichiro Oda to give Usopp the time to shine. That is another reason why a lot of people would like Mosa to be Heracles, since it could give this character another angle where he could shine.
Furthermore, it is also worth pointing out that chapter 1151 already had Usopp trying to reach out to Dorry and Brogy after they were turned into demons by Imu. When considering their past relationship as friends, there is a strong argument to be made that he will be the one attempting to bring them back during this arc.
Final thoughts
While it seems a long shot, the idea of Mosa being Heracles could be a very interesting callback in the anime and could propel Usopp to a more significant role. Furthermore, it would give the character of Heracles a lot more focus and attention, which could be fascinating to see.
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