The only black person to have won Eurovision is Dave Benton, and he was born in Aruba and moved to the USA, before moving to the Netherlands, there meeting an Estonian girl and moving again to Estonia !
Joëlle Ursull was very close to be the first black woman to win Eurovision. But she's french as she was born in Pointe-à-Pitre in Guadeloupe.
French entrants of foreign origin or foreigner entrants...
1965 :
Guy Mardel was born French Sefarade-Jewish in French Algeria
1969 :
Frida Boccara was born French Jewish-Italian in French Morocco
1977 :
Marie Myriam was born in Belgian Congo in a Portuguese family and became French
1989 :
Nathalie Pâque is Belgian
1991 :
Amina is Tunisian
1992 :
Patrick Fiori is born in an Armenian family in Marseille
1996 : Dan Ar Braz was accompanied by a Welsh and a Scottish singer
1997 :
Fanny is from Italian and Spanish descent
2000 :
Sofia Mestari is Morrocan
2001 :
Natasha St-Pier is Canadian
2003 :
Louisa Baïleche has Italian and Algerian descent
2004 :
Jonatan Cerrada is Belgian and has Spanish descent
2005 :
Ortal was born in Israel and has Spanish and North-African descent but she's French
2010 :
Jessy Matador was born in Democratic Republic of Congo and has been naturalized French
2012 :
Anggun was born in Indonesia and has become French with marrying a French man
French oversees entrants :
1981 : Jean Gabilou from Tahiti
1990 : Joëlle Ursull from Guadeloupe
1992 : Kali from Martinique
1998 : Marie-Line was born in the Hexagone in a family from Martinique
bTW, This is France