Intention. In manga you usually have dialogue, inner thoughts and inner monologue
In anime they dont always add all of them, just make do with actions. So sometimes you see characters acting a certain way "just because", meanwhile in the manga you got written exactly what they acted that way
Is overall the same difference from books to movies imo reply
Personality’s, or the little things characters do that make such a huge difference to the entire story
Edit: Skin color too. I feel like most darker characters tend to get lighter in animes reply
Maybe not for translation- but definitely the art style. An example of this would be TBHK. Don’t get me wrong, the anime is very cute- but the sketchy elements that the manga art has is just AUUUGGHHH reply
I feel like sometimes the pacing of a story gets all messed up when it's adapted into an anime. That and, like, the composition of the scenes. I know it can be a challenge to transform manga panels onto a big screen, but sometimes it's very conspicuous and awkward reply