Nuno Alveres

Soccer World Cup nobody.
Mentioned in every game, but no-one knows what he looks like or which club he plays for.
Appeared in every World Cup since 1974 for twelve different countries, changing his first name to 'Dido', Luma' or some other nondescript to match whichever country he's turned up for. Will replace the 's' in his surname for a 'z' if playing for a South American country.
Alveres is mentioned by TV commentators in nearly every World Cup game, but is highly skilled in not doing anything outstanding, bar a few neat passes and the odd header, as to not reveal he's playing in so many teams.

"Cross intercepted by Didier Alvères of France, and it goes harmlessly out for a throw".
"Straightforward tackle by Nuno Alveres, the El Salvadour.....erm....player".