“Hourai NEET” (蓬莱(ほうらい)ニート), or “NEET Princess” (ニート姫(ひめ), Nīto-hime), was a derogatory nickname and fan interpretation of Kaguya Houraisan from Touhou Project, mischaracterizing her as an internet-using hikikomori or NEET that may wear a stereotypical tracksuit.

The misconception stems from a joke in Touhou Eiyashou where Eirin joked that Kaguya was 'finally' playing outside again in the Barrier Team's Good Ending, which leads to Kaguya pointing out that this was actually Eirin's idea to keep her imprisoned in the first place, but people clung onto the idea because cheap jokes were popular, plus you have the stereotype that princesses were sheltered from the world.

In reality, Kaguya mentions several times that she disliked this isolated life, desiring a job to fit in on Earth in the novel version of Touhou Bougetsushou¹⁾ and voicing her boredom in Touhou Eiyashou. Following the incident, she became the Lunar Capital Expo's²⁾ lead organizer, actively socializes, travels to the countryside, attends matches in the Human Village in Touhou Shinkirou, etc.

• Hourai NEET on Pixiv Encyclopedia