you can simply see what works good for your combo from ninja icon then when you move your mouse on the picture of your available ninja you will see a blue bar pop up click to see matches .just try to make your hole team combo with each other

and from what i tried i see those combo work good together for midnight

1- hinata first line you and naruto second line sasuke third line and for now make your passive skill that increase lightning 40 for 5 turns as you have sasuke and hinata same element as u

2-first line empty naruto and you second line sasuke and temari third line that combo is also great with temari 2 stars or sakura 2 stars u able to do the spear skill ( that paralyze the enemy)

anyway you just move your mouse over the picture of any heroes and click see matches and you can do it as you want with your beloved ninja

i hope i helped you even a little bit :)

Thanks for helping :3