Grape-kun was a Humboldt penguin at Japan's Tobu Zoo who captured the internet's heart in 2017 for his deep attachment to a cardboard cutout of Hululu, a character from the anime series Kemono Friends. Following a rejection by his previous mate, Grape-kun was observed spending hours staring at the cutout, even skipping meals to remain by its side. This behavior turned him into a global sensation and a mascot for 'waifu' culture and unrequited loyalty. Today, the meme is used to represent intense devotion to fictional characters, niche hobbies, or anything that brings a person comfort despite being inanimate or unattainable.