grape-kun
A humboldt penguin living in the Tobu Zoo in Saitama Prefecture. Became famous on the internet for his interactions with a cardboard cutout of Kemono Friends' Humboldt Penguin character, prompting many to consider the penguin a friend of hers, a secret admirer, or being hopelessly in love with her while being stuck in the third dimension.
He was distinguishable from other humboldt penguins by the purple armband on his left flipper.
According to zoo staff, Grape used to have a wife called "Miss Green" (distinguished from her flipper band, of course), they used to breed together. Humboldt penguin couples are usually loyal to each other, till death do them part, but apparently Miss Green is an exceptional case. She abandoned Grape and found her new lover, who has kept her company since. Perhaps this is the reason why Grape fell in love with Hululu, a tragic story indeed.
Grape-kun passed away on October 12, 2017. He was 21 years old.