I feel like the human models default players are given are kind of boring. Maybe a little variety? Something to break people away from the CSS feel? No special abilities, but just something different to look at. Of course, the robot & stormtrooper was not what I intended to include when I made this post, but some of these human models seem pretty cool. All of them can be downloaded, if-not-already, in Garry's Mod. There are tons more.