ReiKasa

ReiKasa is the het ship between Mikasa Ackerman and Reiner Braun from the Attack on Titan fandom.

Canon
Initially, Mikasa and Reiner were classmates in the 104th, and were both into the top ten, Mikasa ranking first and Reiner ranking second. They didn't have many interactions on-screen, until season two. There, Reiner and Bertolt revealed themselves to be the Armored and Colossus Titans, Mikasa first went to Reiner, cutting his hand off, planting a blade through his hand and stopping to his wrist, leaving a cut on his cheek. Mikasa then swore that she'd kill Reiner, no matter what. Arriving at where he is after they started running away, along with Bertolt, Ymir, and Eren, who was unconscious. However, she also laments her decision of not cutting their heads off when she had the chance. When she starts reflecting on it, she realizes that she doubted because of who they were to her. Reiner and Bertholdt were different opponents to her than the de-humanized Titans she was used to fight. The fear in their eyes made Mikasa think them as humans again, and she hesitated long enough so that Reinner managed to tackle her.

After they succesfully run away, Mikasa along with the other Scouts form a plan to retake Wall Maria. There, Mikasa is tasked to defeat Reiner, with the Thunder Spears. She takes her last Thunder Spear to forcefully open his jaw, leaving his mouth open so that she can blow his nape out from the inside. With the help of Hange, they are able to. While Hange interrogates an injured Reiner, Mikasa begins treating Jean's injuries.

After the timeskip, Mikasa and Reiner are still enemies, and Mikasa helps Eren defeat the Armored Titan.

Days later, after Annie is taken with them, Mikasa and the others go to see Reiner, who is asleep. He wakes up, is shocked, before they come into an alliance, and help eachother stop the Rumbling.

During the War for Paradis arc, Mikasa saves Reiner's life by killing one of the Titans that was holding him and leaving him hanging in the air, only holding onto Jean's hand.

Fanon
ReiKasa is extremely unpopular throughout the fandoms. As fans mostly see their relationship as a rivalry. Many fans see their dynamic as a competion to see who is the strongest, although Reiner is usually the loser. This ship rivals ReiBert and EreMika. Although this ship is usually seen as rivalry, Mikasa not killing Reiner the first time she had the chance to, was something that started the questioning of some fans of the widely held belief (usually used pejoratively) that Mikasa "only cares about Eren".

Fandom
FAN FICTION

Trivia

 * In one of the poster featuring some of the AOT characters in the school castes; it is derived from The Breakfast Club's one. There, Mikasa is seen as Allsion, and Reiner as Andrew. In the original movie, Allison and Andrew end up together.