(WARNING: Spoilers for Legends Of Tomorrow, The Flash, and Arrow follow)
For those of us who've been following the latest episodes of #Arrow, we know that the conflict between Green Arrow and Prometheus is only continuing to escalate. With every week that passes, it seems like Prometheus thinks of a new way to undermine Green Arrow and we're still no closer to finding out who #Prometheus really is. The only clue provided so far is that Green Arrow killed Prometheus's father, which isn't much to go off of. However, the number of plausible candidates is very limited, so we may already know who Prometheus is.
To be fair, the Green Arrow has arguably killed dozens of people, but he hasn't killed many notable characters who were also fathers. That being said, Oliver might not necessarily be responsible for the death of Prometheus's father. There's a good chance Prometheus believes that Green Arrow/Oliver Queen is responsible for the death of his father under false pretenses. Regardless, Prometheus is still on a vendetta to make the Green Arrow suffer and he'll continue to enact more insidious plans until he reveals his identity — unless Green Arrow figures it out first.
1. Talia Al Ghul
Talia al Ghul recently made her debut appearance in the latest episode of Arrow. Talia first appeared in a flashback sequence with Oliver Queen, during his time with the Bratva. She hasn't been seen in any of the present-day events but we should expect the presence of Talia in the past to foreshadow her upcoming appearance in the present day. Aside from Talia's moments in a flashback sequence, we may have already seen Talia in action as Prometheus.
Talia is the daughter of Ra's al Ghul and could be seeking revenge for her father's death at the hands of Oliver Queen/Green Arrow.
In the Season 3 finale of Arrow, Oliver Queen killed Ra's al Ghul in a duel to become the head of the League Of Assassins. The episode concluded with Oliver delivering the mantle to Nyssa, having her assume the right to lead the League Of Assassins.
As for which daughter could be Prometheus, Nyssa can be taken out of contention seeing as how she wanted her father dead, but Talia could want revenge for her father's death. Then, taking into account Prometheus's fighting style being identical to the styles taught to Oliver Queen by Shado, Yao Fei and Talia, it's reasonable to assume Prometheus was once a member of the League Of Assassins.
Could Talia Want Oliver Queen Dead?
There's also the matter of Prometheus's resilience against a strong sedative, which could be another clue to revealing who "she" is. In "Who Are You," when Oliver injected Prometheus with a dose of Diazepam, Prometheus brushed it off quickly. Prometheus's ability to withstand the sedative likely comes from extensive training, training that could have took place in the League Of Assassins.
Prometheus also performed a signature spinning move over Oliver in their fight, which stuck out to Oliver. The person who taught him how to fight (Talia) must have taught Prometheus the same move, also implying that Prometheus was once a member of the League Of Assassins.
The comic lore behind the League Of Assassins also dictates that each member is trained to control their senses when subjected to sedatives like Diazepam. With that in mind, Talia's long history as a member of the League Of Assassins could have seen her learn how to control her senses to a degree where she'd no longer succumb to the influence of drugs/sedatives like Diazepam.
More to the point, Prometheus's hand-to-hand combat ability and strengths might all be obvious indicators of Talia being the woman behind the mask. Along with the fact that Oliver Queen killing Prometheus's father, Talia could be using the Prometheus identity to exact her revenge on Oliver Queen.
We should also point out that in Talia's introductory episode, Talia had in-depth knowledge of Oliver Queen before she even met him, so Talia's past knowledge of Oliver could explain how Prometheus knows so much about him when no one else outside of Team Arrow could possibly know everything Prometheus knows.
The other logical candidate would be Mei. Mei hasn't been seen since her flashback sequence in Season 4, but she's still alive (as far as we know).
If you're not familiar with Mei, she's Shado's twin sister and the daughter of Yao Fei. Shado and her father, Yao Fei, only appeared in Season 1 of Arrow and both died on Lian Yu. Mei is currently the only surviving member of their family.
Mei wasn't with them on the island but she learned of what happened from Oliver Queen when he visited Mei in China. Oliver was on other business but he was able to explain what happened to Yao Fei and Shado before he left. However, Mei might have perceived the news differently than we think.
Mei responded the way you'd expect but there's a good possibility that Mei's response to Oliver's story was simply a front to have him leave her alone (for the time being). If so, Mei might have wanted Oliver to completely turn away from her so that she could set forth a secret plot for revenge, because in reality, she can't take Oliver's word when he says Yao Fei and Shado died at someone else's hand. Her suspicion/paranoia could have lead Mei down a path to seek revenge.
When we pair Mei's presence in the #Arrowverse with the sole clue to Prometheus's identity being the death of his father by Oliver Queen, it makes sense that Mei could believably be Prometheus. If she's under the misconception that Oliver Queen was responsible for her father's death then her vendetta as Prometheus could be all due to her delusional thinking.
Who Do You Think Prometheus Is?
Those are just two theories on who Prometheus probably is, based on the one tidbit of information we've been given towards discovering his/her identity. Who do you think is really hiding behind Prometheus's mask? Could it be an alternate version of Oliver Queen? Or, someone completely unrelated to Arrow? Leave your thoughts in the comments section below.