I only write all the dialog and invent most of the universe, there's a whole team of people working on the characters and their personality of whom I am only one and not even the most important one!
I never get a chance to get a big head about this stuff because I'm surrounded by stupid-talented people I am constantly in awe of.
Someone asked where Slim got his name and I failed to answer that on the livestream.
When we were sitting in the conference room talking about the idea of an alien and he was at that point going to speak an alien language you would not be able to understand, I thought the humans on the team would have to give him a nickname and I remembered the Skinnies from Starship Troopers.
So I just said "They'd probably give this alien a nickname based on what he looked like, like 'Slim,'"
Scott and Phil responded well to that and from then on, he was Slim. I think it influenced his art, we wanted someone tall and lithe, someone who might look like a Slim.