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Origins of Metal Slug characters - Mass Distraction - 05-19-2013
Marco and Fio (in addition to her teddy bear) have their names taken from an old anime series called 3000 Leagues in Search of Mother.
Character wiki pages: http://snk.wikia.com/wiki/Fiolina_Germi & http://snk.wikia.com/wiki/Marco_Rossi
The anime's Wikipedia entry: http://en.wikipedia.org/wiki/3000_Leagues_in_Search_of_Mother
List of the characters in the anime, pictures included: http://www.animecharactersdatabase.com/source.php?id=102076#characters