1. In the Nailong Series Nailong: The protagonist, a chubby, small yellow dinosaur with a milky, cute voice. He is naive, loves to eat, a bit silly, but very kind and warm-hearted. Lulu: Nailong's best friend and companion. He is a small blue creature. He is relatively smarter and more clever, often going on adventures with Nailong and looking after the somewhat "not so bright" Nailong. Relationship: They are inseparable best buddies and brothers. Their daily life involves playing, exploring, and getting into mischief together, full of childlike innocence and joy. Their relationship is the core of the Nailong series stories. 2. In the Mini Special Force Series Ruby: She is an important female character in Mini Special Force, a pink fox. She is intelligent, agile, and serves as the team's technical support and sniper. Lulu: Also a member of the Mini Special Force, he is a blue beaver (Note: This Lulu and the Lulu from Nailong are different characters who share the same name). He is very strong and serves as the team's powerhouse. Relationship: In the storyline and official materials of Mini Special Force, Ruby is Lulu's girlfriend. They are an official couple (CP), cooperating seamlessly in battle and sharing a close personal relationship. Summary and Clarification: The reason you might associate all three together is likely because: Shared Name: The best friend "Lulu" in Nailong and the agent "Lulu" in Mini Special Force have the exact same name, which can easily cause confusion. Online Mashups: On short video platforms like Douyin and Kuaishou, creators often mix characters from these two popular IPs to create new stories, such as plots where "Nailong's best friend Lulu has Ruby as his girlfriend." These are very popular and lead many viewers to mistakenly believe they exist in the same fictional universe. In simple terms: In the world of Nailong: Nailong and Lulu are best friends. In the world of Mini Special Force: Lulu and Ruby are in a romantic relationship. In fan creations online: All three can interact in various interesting ways.(雪球｜xueqiu)