Why does AGS start out with Roger Ego as a character?? Shouldn't there be nothing for you to start out with, so you can start from scratch!?!
Because you won't need to start from scratch that way.
What's the problem, actually?
The idea is to replace the roger sprites with your own character sprites when you have them, that way you don't need character graphics to start scripting the game. Roger and blue cups make useful temporary graphics.
If you really want to you could get rid of all the sprites when you start a new game but I'm not sure it would compile.
Yeah, so all you need, in order to run the ever first build, is to import a background image (draw some walkables maybe), save the room and finally click on test game.
~Cheers