DiverDiva

KarinAi is the femslash ship between Karin Asaka and Ai Miyashita from the Love Live! fandom.

Canon
Karin is the mature model of the group- while Ai is a friendly, sociable person who loves to make puns. In April 2019, there was a subunit selection poll, where Karin and Ai where voted to be the duo. Since then they have worked together in a subunit named DiverDiva. They're both rather fashionable, Ai being a gyaru and Karin being a model. They barely had any interaction in the Anime until the second season's 4th episode.

Fanon
Though in a slow start, Karin and Ai is shipped by a small number of fans, given their visual similarities to NozoEli and KanaMari when it comes to sharing hair colors (dark blue/purple and blonde). Once the DiverDiva subunit is formed, the ship became popular for a very short time. It ended up becoming less popular with the release of the anime, as ships like AiRina and KarinEmma became more popular, while KarinAi barley got any focus.

Aside from their visual similarities, another notable difference is that they're much closer to being an EliUmi expy when it comes to age.

Fandom
PIXIV