Gap youkai are a type of supernatural creature from Japanese folklore, specifically associated with the Yokai category. They are known for their ability to manipulate space and create gaps or portals, allowing them to travel between different dimensions or locations. This unique power makes them elusive and difficult to catch. One of the most famous gap youkai is Yukari Yakumo, a character from the Touhou Project series. She embodies the traits of gap youkai, using her abilities to control boundaries and gaps in reality. This makes her a powerful figure within the lore, often involved in various conflicts and events.