EreMika

EreMika is the Het ship between Mikasa Ackerman and Eren Jaeger from the Attack on Titan series.

Canon
Eren and Mikasa were 9 when they met for the first time. Eren's dad was coming to visit the Ackerman as doctor and brought Eren along. They found the parents dead and Mikasa missing. It turned out she was kidnapped by her parents murderers, who intented to sell her as sex slave.

Eren came in time and tried to save her by killing two of her kidnappers. But the third one managed to grab Eren and strangled him. Eren screamed Mikasa to fight and his words made her awaken a surhuman strength, which helped her to kill the man. Later, Eren offered her to come home with them after giving her his scarf.

This scarf becomes a huge symbol in their relationship.

Mikasa then grows protective of him and saves him from Armin's bullies. This fact annoys Eren a lot, who envies her strength.