Simon is a great thinker. He's analytical and always thinking. We discussed characters that seem to be in two places at once. They're involved in the real life happening action but at the same time, thinking about something else. These characters move suddenly as idea after idea pops into their head. Our major character influence is the 9th Doctor (played by David Tennant) as he always seems to be in another place just thinking.
Carl is a lot harder to place in existing character world... but he's essentially the opposite. He's calm and secure He already has the answers he needs as he has his religion. His movement is graceful and flows from one movement to the next. The best character I could think of the compare him with is Dr. Watson from BBC's Sherlock. He is the opposite of Sherlock, who is one of Simon's influences, he's calm and kind and doesn't move around as erratically as Sherlock. When there's action he's involved but otherwise he's happy to sit and enjoy the surroundings. Zevran (a character in Dragon Age: Origins) is here as purely movement influence. He moves in a light, delicate way which would contrast the sudden movements of Simon. Same for Quasimodo, he's graceful and gentle.