From left to right are Suko, Xico, and Mazai.
I kept their jacket designs pretty simple, but noticeably different from one another. Xico's jacket seems to have a bit of a Star Trek influence, but I was initially thinking of something more like a simplified racing jacket. I think I will keep it like this, and maybe add a subtle joke to the back of his jacket.
And here's my pencil sketch, before I adjusted their relative heights: