Juliano is the pet cat and constant companion of the young boy Hashizo in the anime Ai Shite Knight. He is not an ordinary feline; his defining characteristic is his exceptionally high intelligence, which sets him apart from a typical animal. Despite his cleverness and unwavering loyalty to Hashizo, Juliano has a notoriously grumpy and difficult personality. He is generally distrustful and wary of strangers, preferring to keep his distance from those he does not know.

Within the story, Juliano serves as Hashizo's closest friend and protector. Because Hashizo's older brother, Go, is frequently busy with his music career as the lead singer of the rock band Bee Hive, Hashizo spends a great deal of time alone. During these periods, Juliano is his primary source of companionship and emotional support. The cat is a constant presence at Hashizo's side, and their bond is a central aspect of his role in the narrative. For much of the series, Juliano provides comic relief, with his irritable reactions to the people and situations around him adding a layer of humor to the ongoing romance and drama.

One notable aspect of Juliano's character development involves his attitude towards women. At some point after being adopted, he developed a pronounced misogyny or a crisis of hating women, which becomes a recurring comedic trait throughout the series. This grudge against the opposite sex is a specific and unusual quirk that adds to his role as a source of comedy. His abilities are not magical or superhuman but are instead rooted in his remarkable intelligence and almost human-like capacity for understanding and reacting to complex social situations, which often leads to his amusingly sour expressions and judgments. He is defined by his dual nature as both a faithful, intelligent guardian for Hashizo and a perpetually disgruntled, misanthropic (and specifically misogynistic) animal.