I'm just wondering, does Ryan do the story? Or is it Lar? Or do they both think about the story? Who's the one with the evil mind here?

Who has the Richard in him? And who draws it? Or do one draw and the other colours?
I'm most interested in who comes up with the evil Richard stuff... Sohmer seems to fit this description, tough, I wouldn't underestimate Desouza nether...

Some help to clear this out?