Fang is compatible with Rikku and Vincent.

Rinoa is compatible with Cloud and Yuffie.

Lightning is compatible with Snow and Tidus. 

Tifa is compatible with Squall and Hope. 

Rikku is compatible with Fang and Vincent.

Cloud is compatible with Rinoa and Yuffie. (LOL)

Snow is compatible with Lightning and Tidus (PFFFT LOL)

Squall is compatible with Tifa and Hope. (WTF?)

Vincent seems to be “compatible” with Fang and Rikku apparently. (thats just lol)

Yuffie is compatible with Cloud and Rinoa.

Tidus is compatible with Lighting and Snow.

Hope is compatible with Tifa and Squall. (Still loling)