Todd isn't particularly interesting as an individual, but rather the contrast between him and his two sisters is an interesting study in the by-products of post-1960's feminism. On the one-hand, Todd's two older sisters were brought up being told that they could do and be anything they wanted, and that no one could tell them otherwise. Expecting that they could have it all, they both became overachievers, and currently try to balance successful careers and each have begun their own families.
Then, on the other hand, there is Todd. He grew up with the implied message that since he was a boy, he would have it easy in a Man's world. Consequently, he was raised with lowered expectations. He is pretty smart, but has a horrible work ethic. Only his athletic prowess was really pushed to any degree. He putzed around university a few years, juggling various girlfriends and majors, and finally stopped going after he became a manager at a sporting goods store. Now, he mostly spends his time exercising his masculinity in those realms that feminism has largely ignored: farting, playing FPS games online, stashing nuts and watching MMA.