Simpatico:
congenial or like-minded; likable:
I find our new neighbor simpatico in every respect. [Dictionary.com]
Noted in “‘Chuck and Nancy’ present a united front in challenging Trump on border wall,” Seung Min Kim, WaPo:
No two principals in the shutdown fight have presented a more united front than “Chuck and Nancy,” as Trump has dubbed them. The two leaders have refused to make any key strategic moves in the shutdown fight without consulting each other and have become so simpatico that their staffs regularly joke that the two finish each other’s sentences.
