That third gif in the right column. I don’t go here so I can’t really form an opinion regarding chemistry, but the fact that the actress continues with the character quirk even though her hands are practically off camera shows that they are really comfortable in their characters and as scene partners. Unless it was in the script and then it’s just good writing.
Okay, first of all: go here! Heh.
But yeah, there are a ton of little moments which I can’t quite decide are actress choices or written in. It’s a freaking telenovela, by which I mean, there’s so much going on and it’s designed to be very exaggerated and expansive, I can’t imagine they have the time to write in every subtle little thing, especially for non-leads. I can only imagine they’ve given the actresses considerable freedom and have some attentive directors and editors.