[gobo]

Of the two high-strung Turtles (Leo & Raph, of course), I'd bet on Leo going over to the dark side first. I could see him bringing so much pressure upon himself that he snaps. Actually, I can see him snapping just because of what he thinks everyone is expecting of him. Raph might be ready to beat the living snot out of bad guys, but I can't imagine him ever losing his compassion. It's just not within his capabilities. It'd take a lot to get him to turn.