Here's some old model sheets from season one. Someone pointed out that the team lineups were never posted. These drawings are the FINAL DESIGNS from way way back in 2006. You probably might have guessed that here were all sorts of design changes during the development process -- but did you know that these drawings are the 19th version of the lineups?
Earlier lineups had different colours, character sizes, heights, etc. But this is pretty much where we ended up before the show started airing in July 2007.