Pedro left his home in Colombia, South America, to work hard and earn a wage to support his son and sexy wife. Instead, he ended up dying in a horrible fire for which Excel was more than a little responsible.

After spending some time as the Great Will of the Macrocosm's boy toy, Pedro escaped and returned home- only to find that his loved ones had already forgotten him and taken up with his neighbor, Gomez.

source: absoluteanime.com

While he is present, he can hardly even be considered a character in the original manga version, since he only has two appearances, the first of which being in a single panel as more of an easter egg than a cameo. The second time he is merely mentioned by name as an in-joke.