Is this box an official MTG product? Who are the featured characters?
That is the Battle Royale box. It's a preconstructed theme deck box from November 1999, and it came with four 40-card decks. It came out during the Masques block, between Mercadian Masques (October 1999) and Nemesis (February 2000).

I can't find any indicators of who the box art depicts. It doesn't seem to be a card art reprint &mdash; Christopher Moeller is credited for the box art, but it matches none of his Battle Royale cards' art. It doesn't even match the art style used on cards at the time, and it doesn't seem to depict anything from cards in the box. The official product page (from a very old part of the Wizards site) just calls it the "Battle Royale Box Art". Probably Moeller was just told to paint a bunch of fantasy creatures fighting and they put that on the box.

(Thanks to Jefromi for checking through the card art too, and finding Moeller's art.)



How I found this out, for future investigators: I searched Google Images for "mtg 1999 deck box", since that copyright line means it must have come out in 1999. The results showed boxes of this type were either starters or preconstructed theme boxes. "mtg starter box" didn't get me anywhere. I opened the list of MTG sets, and googled "mtg sixth edition preconstructed box", and then "mtg nemesis preconstructed box" (that box looks nemesis-y), and found photos of a box exactly like that one, and one of them was on a MTG Salvation Wiki page.