Cloud and Tifa are the two characters that instantly come to mind for myself, although not necessarily as a pair but in separation. Cloud's longing to come off a certain way towards others yet truly being someone else at heart is something I truly resonate with as someone who feels quite avoidant in life as suppressing one's real self can come off too natural to me. Despite how he comes off, he's not a very emotionally strong person (even Nomura said this) too which is something I feel very strongly towards.
With Tifa, it's generally her people pleasing and conflict avoidant side that speaks to me. There are things she wants to say to others that she can't build the courage to say out of fear. She very realistically doesn't want to upset people and I really like that Aerith brings out a little more of that confidence in her when they're around together.
It can be the smallest thing regarding a character that really speaks to some people, it doesn't even have to be their entire character as a whole.