One of the reasons is that, Levi and Eren is the most popular character on AOT fandoms (third place come close to Eren's rank is Mikasa). Fans tend to ship the most popular characters to each other especially when they're two hot dudes.
Two of the series most popular male characters, Eren for his obsessive resolve and Levi for his rugged good looks, have a relationship that has peaked some considerable interest— or, at least, their lack of a relationship has. However, there are times when there seems to be some form of a friendship between these two.
When it comes to Attack on Titan ships, Jean and Marco often rank among the most popular pairings. A quick Google search can confirm that a large number of anime fans are on board for these two (or they would be if Marco hadn't perished way back in season one.)
List#portmanteaucharacters16149EreriLevi Ackerman/Eren Jaeger9140EruRiLevi Ackerman/Erwin Smith6894JeanMarcoMarco Bott/Jean Kirstein3995YumiHisuHistoria Reiss/Ymir
TodoDeku is a non-abusive and well suited ship. If you've seen season two (the fight) Midoriya helped Todoroki change his ways. If it wasn't for Midoriya Todoroki wouldn't be visiting his mother. It's not just the fight that plays a big role in this ship.
Almost as popular as the Deku and Bakugo ship is the pairing that puts Bakugo and Kirishima together. It's hard to deny these two have chemistry, and the fact that Bakugo actually views Kirishima as his equal -- and remembers his name -- is enough to fuel this particular pairing.
On AO3, TodoDeku is currently the 3rd most written ship in the My Hero Academia tag. It is the most written ship for Todoroki and the second most written for Midoriya.
In the Eastern side of the fan base, BakuDeku is the most popular ship among fans due to their complex relationship and how their frequent interactions explore the classic rivals and childhood friends trope.
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