Everyone besides Asterios and Ignacio had normal, human shaped heads. It could be debated that Mazzucchelli didn’t want the reader to get them mixed up with other characters. However, I see their heads as half of a circle. Putting Asterios’ and Ignacio’s head together would produce a full circle, which represents their connection. Since Ignacio does not exist physically, one half of the circle is missing, and leaves Asterios with a sense of loss.
Another interesting thing to note is the fact that the book’s dust jacket does not completely cover the book. It was the most frustrating thing to encounter and I promptly took it off. This makes me think of Asterios, he is so focused on clean lines and evenness, but the rigidity that he believes in makes him lose out in the end.
Finally, I absolutely loved the way that Mazzucchelli changes everyone’s speech bubbles and fonts to match their personality. Asterios has a box speech bubble with a font you would expect to see on documents and Steven (AKA Spotty) has a sketchy bubble because he’s a little sketchy. Stiffly’s bubble is mostly round, but has a few loose squiggles in it, whereas Ursula’s bubble is cloud like and the font has a sort of regal or cosmic quality about it. Which brings me to my favorite part, when you look at their son’s speech bubble; it is a combination of the two.