Rocky appears to be a rather quiet kid, with an interest in video games and sports. Despite his indifferent demeanor, he seems to be polite and nice, given his friendly interactions with Lincoln. In contrast to his rather "normal" personality, Rocky also appears to have a liking to the macabre, given his immediate fascination with Lucy.
Like Rusty, he has acne which could mean that he is going through early puberty as well.
His Polish name is Rysiek, from Ryszard (Richard).