YoshiDia

YoshiDia is the femslash ship between Yoshiko Tsushima and Dia Kurosawa from the Love Live! fandom.

Canon
YoshiDia is not a popular one. Yoshiko and Dia are shipped together as they are the one who don't have a best friend with their respective classes along with You. They are shipped together as best friends in Omoi yo Hitotsu ni Nare.

They are shipped together more as they have the same type of personality (caring and loving for their group). Dia cares for her group, which she does for her sister Ruby. While, Yoshiko calles her group members "Little Demons" as a love and care for them. Their same type of personality makes them being together. Dia also advices Yoshiko not to wear black clothes while practicing in summer time.

Fanon
YohaDia is not popular due to third years and first years have didn't their moments together. They got their moments too low on the movie.

They got their pairings in Omoi yo Hitotsu ni Nare, and finally when Dia feels honoured when Yoshiko offers her fallen angel feather. Instead of these two pairings, the most popular are DiaRuby and KanaDiaMari. While for Yoshiko, the most popular are YouHane, YohaMaru.

It is known to us that they are not as much as close. But as they have the same type of personality, and Yoshiko always following Dia, they may be close to each other. It is also known that as Dia started calling (chan) to Yoshiko and You first, it is known that they ar ethe most closest to each other than going with three best friends. After this discussion it'd be known that Love Live Aqours can be shipped as - ChikaRiko, KanaMari, RubyMaru, and YouYoshiDia