lol, but I mean characters that have no life to them, or speak with no variation. Example(I love examples)
Robot: First, we need to go up the path and turn right. Then, we must...
OR
Robot: Ugh, in order to get to our destination we need to follow this stupid path! Why is it sooo long? Ugh! Of course, as if it wasn't already hard enough, THEN we have to...
Which of those has more expression to it? I don't know why I'm telling this to you, you do a fantastic job with dialouge :)