Like renga and klance and all that good stuff which works because they're polar opposites of each other. (Edit: FORGOT CAITVI)
There's also the black orange dynamic
Like kagehina and sasunaru and to an extent, shatt (yes that is their actual ship name) which is almost ALWAYS rivals (ANOTHER EDIT FORGOT RAYEMMA)
And then a personal fav of red/green
Like LadyNoir, Zolu, and matchablossom.
Like idk color theory or science or shit but THERES GOTTA BE A PATTERN HERE. why is red and blue sometimes so good, and sometimes red and green? I do not know.
EDITING THIS CAUSE THE AMAZING @astriddestelle CALLED ME OUT!!
Pink and black is also a fan favorite featuring itafushi, sasusaku, and whatever that ship is called
Their height difference..Sasuke slightly bowing down to reach for Sakura's hand..the way he so gently takes it and slowly lets go, lingering on her fingers for as long as possible before letting go...