Where is he from?
For whatever reason, I had no idea who this character was before I started researching for this page, which in hindsight is kind of ridiculous. He might be among the most prolifically adapted characters ever. Lupin appeared, by my count, in nine different movies even before the introduction of SOUND. With so many versions of the character, and without having seen any of them to judge their quality or relevance, the best I can do is give you a collection of what I could find.
While movies featuring Lupin date all the way back to The Gentleman Thief in 1908(!), the earliest image of the character I could find was this promotional image of Earle Williams as the character for 1917's Arsène Lupin.
The character appeared again only two years later in 1919's The Teeth of the Tiger, played by David Powell.
The sheer number of adaptations make them all hard to track, but some of them stand out, like 1932's Arsène Lupin, when he was played by John Barrymore, a man who was described in his New York Times obituary "the foremost English-speaking actor of his time."... which he should probably be more famous for than as the grandfather of Drew Barrymore.
But Barrymore wasn't the only American actor of that era to play the quintessentially French character.... here's he's being played by Broadway veteran Melvyn Douglas in 1937's Arsène Lupin Returns...
Which, weirdly, came out BEFORE 1944's Enter, Arsène Lupin, even though it sounds like a sequel. Here he's played by the notably young and dangerously dashing Charles Korvin, which is a twist of characterization that crops up occasionally with the character...
...as evidenced very quickly back in the character's homeland, where Robert Lamoureux is clearly bringing quite a bit of dangerously French sexiness to Lupin in 1957's Les Aventures d'Arsène Lupin, and then again in 1959's Signé Arsène Lupin.
Meanwhile, Lupin also began appearing on television, like in the 1971 series Arsène Lupin which starred Georges Descrières.
And then again in the series Le Retour d'Arsène Lupin that ran from 1989–1990, and the follow-up series Les Nouveaux Exploits d'Arsène Lupin from 1995–1996, where he was played by the quite debonair-looking François Dunoyer. Again, I haven't actually seen ANY of this, but I am starting to develop a little bit of a headcannon from reading about all of it, and this is kind of how I'm starting to imagine the character.
There's also the 1996 French-Canadian animated series Les Exploits d'Arsène Lupin, which was also broadcast in 1998 under the English title Night Hood. Lupin was voiced here by Luis de Cespedes.
Of course, anime fans are likely more familiar with the character Lupin III, the star of the manga Lupin III by Monkey Punch that was published from 1967-1969, it's follow-up Lupin III – World's Most Wanted from 1977-1981, and then several different animated series that ran as early as 1971, and as recently as 2016.
The anime character is so popular that he actually had a live action movie in 2014, Lupin the 3rd, starring Oguri Shun...
...but Lupin III was far from the only Japanese-language version of Lupin. There have been Japanese versions of the character dating all the way back to the movie 813 in 1920... the latest version is 2011's Lupin no Kiganjo starring Kōichi Yamadera.
Speaking of international takes on the character, there was a series called simply Lupin in the Philippines in 2007, where the character was based on both the original character and on the Manga. He was played by Richard Gutierrez.
Pika herself specified exactly which version of the character served as the basis for her take on the character: the 2004 movie Arsène Lupin starring Romain Duris.