KaiNami

KaiNami is a Femslash ship between Kairi and Naminé in the Kingdom Hearts series.

Canon
Kairi and Naminé were connected long before the two ever met because Naminé is Kairi's nobody. At first, Naminé replaced Sora's memories of Kairi with memories of her so that he would come and save her. However, she felt guilty of this and later helped Sora remember Kairi and agreed to fix his memories. Naminé was slightly jealous of Kairi at first after seeing how much Sora cared for her but eventually got over it because she realized that it was wrong to mess with memories.

One year later, Kairi was kidnapped by Organization XIII and imprisoned in the Castle that Never Was. Naminé appeared with a corridor to darkness and helped Kairi escape from her cell. She helped her run away from the organization while holding her hand but eventually began to blink away because they were so close to each other. Riku eventually appeared so Naminé had him continue the rescue mission for her. After Xemnas' first defeat, Naminé appears in a transparent state and opens a corridor to darkness so that everybody can get home and Kairi thanks her. The two then merged and were both happy when they returned to Destiny Islands.

Fanon
KaiNami has a decent amount of popularity and is one of the most popular femslash ships in the Kingdom Hearts fandom. Femslash ships in this fandom tend to not be very popular unlike the slash ships so it is not as popular as ships such as Soriku or RokuNami. KaiNami mostly set sail in Kingdom Hearts II as that is the game where the two finally met. Many liked the fact that Naminé helped Kairi escape while holding her hand.

Trivia

 * Naminé was actually created when Sora released his and Kairi's hearts and not when Kairi first lost her heart.