Short answers, pulled from the story.
The Mister Europa European Player of the Year Award was an annual basketball prize created in 1976 by the panel of journalists at the Italian weekly magazine Superbasket. It recognized the best basketball player holding European citizenship each season, including players competing in the NBA, and was awarded until 2010.
Croatian small forward Toni Kukoč holds the record with four Mister Europa wins, three of them consecutive. His wins came with clubs including Jugoplastika/POP 84, Benetton Treviso, and the Chicago Bulls.
Mister Europa was created twenty-nine years before the official FIBA Europe Men's Player of the Year Award, making it the oldest European basketball player of the year honor. It was a journalism prize chosen by the panel of Superbasket magazine, not an award issued by the sport's governing body.
Yes. Players with European citizenship were eligible regardless of where they played, including the NBA. Arvydas Sabonis won while with the Portland Trail Blazers, Dražen Petrović won while with the New Jersey Nets, and Pau Gasol won twice with American teams.
The award was created by the Italian weekly basketball magazine Superbasket, whose panel of journalists served as the selection committee from the award's founding in 1976 through its final edition in 2010.
Multiple Mister Europa winners are enshrined in major halls of fame. Toni Kukoč, Dino Meneghin, Dražen Petrović, Arvydas Sabonis, Nikos Galis, Šarunas Marčiulionis, Vlade Divac, and others on the honor roll are members of the Naismith Memorial Basketball Hall of Fame, the FIBA Hall of Fame, or both.