Zelda, the Gamer Witch. She has a challenging nature, and is always looking for players to join the MMORPG that makes up her Barrier. It resembles a classic magic-infused quasi-medieval European setting a la Lord of the Rings or The Chronicles of Narnia, and the "players" may be entranced by its well-rendered realism (and their assigned clothing and roles as mages, elves, dwarves, etc.) at first…until they realize they can't log out and are trapped in the game until they defeat the Witch, who resides at the top story of a huge, castle-like tower dominating the landscape.
The Witch is incredibly powerful (perhaps even rivaling Walpurgisnacht), and as such no one has actually seen her. (Descriptions of her barrier only come from Puellae who were fortunate enough to escape.) Some have theorized that she may actually be the castle itself, or even the entire landscape of the game. Others have wondered if the Witch is actually in the other, smaller castle several weeks' journey away on the other side of her barrier.
Her Familiars are collectively named Nolan and Gary, and appropriately enough their duties are to serve as the "game's" antagonists, assuming the form of orcs, goblins, skeletons, liches and the like.
Shigeru Miyamoto said the famous princess was in fact named for Zelda Fitzgerald. Given the nature of Witches (and Mrs. Fitzgerald's mental state), I thought it would be a good choice for Kuroi's form here.
You can probably guess which recent anime inspired Kuroi's Witch form and barrier.
Nolan Bushnell was the cofounder of Atari, and Gary Gygax was the creator of Dungeons and Dragons.