ThanMegZag

ThanMegZag is the poly ship between Thanatos, Megaera and Zagreus from the Hades fandom.

Canon
During his off-times, Zagreus has the opportunity to get closer to both of his childhood friends, Megaera and Thanatos, and it is clear to all three of them that they caught feelings for each other. Should Zagreus reach a certain level with both of them, without confirming his feelings for either, Meg and Than would have a talk with each other off-screen and come to an agreement. Surprising Zagreus in his bedroom, Thanatos casually greets him while Megaera laughs a little. She then asks him why he’s surprised when his bedroom has no doors. Zagreus is perplexed at seeing them together, at first, he thinks that both believe that he’s cheating on one with the other. But then he realizes that both are smiling at him and quickly realizes what both were already thinking. Megaera then tells Zag to give both of them more credit, saying they’ve already been friends before Zag’s birth. Thanatos agrees and Megaera points out to Zagreus that both of them are off-duty. Zagreus is then given the option to go to both of them, if he wants to do so. He comments that he would be very mad if this turns out to be a dream, but then realizes that there’s only one way to find out. They then engage in a spontaneous threesome as the screen fades to black, all of them laughing happily. The aftermath left Zagreus speechless and even after both of them leave, he couldn’t quite put his feelings into words.

Should Zagreus romance Megaera first, Thanatos will confront Zagreus in his bedroom instead. Thanatos sounds hurt when he asks Zag if he really meant it when he said that they ought to take their time. Zagreus then has the option to comfort him, telling him he’ll wait for him however long it takes. Thanatos tells him that he couldn’t make up his mind if he tried and that he shouldn’t wait for someone who is already there for him. Zagreus sounds very relieved, but has concerns about Megaera having been in his bedroom before. Thanatos scoffs at his concerns, telling Zagreus that he knows her far longer and that it was her idea. Zagreus doesn’t doubt it, which is followed by the screen fading to black and both Zagreus and Thanatos engaging in intimate laughter. Later, Zagreus notes that Than has been quiet for a bit too long for his tastes, asking him what’s on his mind. Thanatos tells him to not take his silence the wrong way, asking him if it is alright if they see each other again. After Than leaves, Zagreus says that it is to himself, then sighs.

Should Zagreus romance Thanatos first, Megaera will say that she has to trouble him with something while in his bedroom. He asks her what it is, only to notice her looking at him rather sternly. Meg is fed up with his talking, telling him to come to her. Zagreus stammers when he sees Megaera clapping her whip against her palm. He then has the option to choose to be with her, with the flavor text saying “Either way, it will be OK”. The screen fades to black as Megaera gives a genuine laugh as a whipcrack is heard, followed by Zagreus moaning and whispering “wow”. Later, Zagreus asks Meg whether they are “good”, trying to find the right words. Meg comments that he’s asking to many questions, but also agrees that for now, they are. She adds that if he tells another soul about what just happened, she’ll kill him for it. Zagreus asks if he has to keep it a secret from Than, Megaera reassures him that Than will figure it out and that he wants what’s best for Zag. She also doesn’t see him as the “jealous-type”, pointing out that she has a good working relationship with him. Zagreus is concerned about whether he’s allowed to keep his relationship with Than going, Megaera tells him that they’re not like the monogamous mortals and that “the heart knows no bounds”.

Sometimes, Zagreus can spot the two of them chatting about him when he enters the lounge.

Fanon
Despite being a case of a canonical poly relationship, ThanMegZag is not the most popular poly ship in the fandom, Zagtrochilles is.

However, people were amazed that not only does the game allow Zagreus to be in a gay relationship, but in a polyamorous relationship as well. The fact that the relationship is portrayed positively is just icing on that cake, though people have noticed that romancing Megaera after Thanatos does come off as a bit like she is trying to convince him to cheat on Than (even though other routes clarify that Than is completely fine with it). When it comes to depicting how Megaera and Thanatos feel about each other, people like to interpret their "working relationship" as "Oh, they're doing it already", but just as many people think that they entered the relationship for Zag's sake. The headcanon that Thanatos is gay is often cited as the main reason why Meg/Than is more of a rarepair.

On AO3, ThanMegZag is the second most popular ship for both Megaera and Thanatos and the fourth most popular ship for Zagreus, as well as being the sixth most popular ship overall.

Fandom
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Variations

 * MegZag refers to the ship between Megaera and Zagreus
 * ThanZag refers to the ship between Thanatos and Zagreus