This first guys is a Grasshopper Assassin:
The idea here is that he's fast and deadly. He springs at you from above, goes for the jugular and then leaves just as quickly.
Immidiatly after I realized I should have done more thumbs to flush out my design so for the next guy I've done a few:
This one's my Beetle Bruser. He's the slow heavy hitter type, standing in contrast to our assassin. I'm going to take a day to reflect then put together a much stronger drawing of one of these.