Eren is a late-blooming Graceling who’s still not quite sure what his Grace is. (Perhaps, like Katsa, his Grace is survival because god knows the boy “dies” enough in the canon storyline and/or miraculously gets out of deadly situations is2g some of those injures should have been instadeath wtf Jaeger. Maybe your Grace is pure dumb luck you idiot)
Annie and Mikasa are Graced Fighters, who are in constant rivalry to outdo the other.
Marco’s Grace makes him something of an empath/natural counsellor, and allows him to pick up on other’s feelings and diffuse tension in difficult situations.
Jean and Armin aren’t Graced. Jean is simply a very charismatic person, and Armin is extraordinarily clever. These qualities help them both keep up with their Graced friends.
Hanji’s Grace is her photographic memory. Despite being outwardly eclectic, her brain is inwardly very organized and her Grace paired with her natural curiosity allow her to investigate and draw conclusions others wouldn’t have considered.