The Wall Street Journal followed Brook Lopez when he attended the Comic Con on Sunday, and to answer your initial question, he did not dress up as a comic-book character.
However, he did revel in his nerdiness as he felt at home with the legions of other comic book nerds and reveled how intricate of a comic-book collector he really is.
"I have to show you this," he said as he scrolled through several photos. "To organize all my comics, I've been making custom cabinets."
A constant topic of conversation: Lopez's storage-cabinet project, which is quite involved. For each alphabetized drawer, Lopez is commissioning an artist to draw a comic-book character whose name starts with that letter. Lopez has lost track of how many comics he owns. "Thousands," he said, "at least." He visited with Jim Calafiore, who had already contributed to the project with a drawing of Aquaman.
