Ep 10. Onichan

In "Onichan," the tenth episode of the third season of Miraculous: Tales of Ladybug and Cat Noir, our superheroes Ladybug and Cat Noir must save Paris from a new akumatized villain. The episode begins with Marinette's younger brother, Chris, returning from college in Shanghai to visit her in Paris. However, Chris' enthusiasm for his new life quickly turns dark when he becomes upset with how lonely he feels in Paris compared to Shanghai. When the villain Hawk Moth senses Chris' negative emotions, he sends an akuma to possess Chris and turn him into the powerful villain "Oni-Chan."

As "Oni-Chan," Chris has the power to create portals, which he systematically uses to wreak havoc on Paris. He jumps from one location to another, causing chaos and destruction in his wake, while Ladybug and Cat Noir try to catch up with him. Ladybug, using her quick thinking and clever strategies, manages to disable some of Oni-Chan's portals and ultimately track him down to the Eiffel Tower.

Upon confronting Oni-Chan, Ladybug and Cat Noir realize they're dealing with someone they know and care about. Marinette sees her brother's troubled emotions and decides to talk to him, trying to reason with him and ease his pain. Meanwhile, Cat Noir fights Oni-Chan one-on-one and manages to distract him long enough for Ladybug to grab the akuma and release it from Chris.

Once Chris is back to his usual self, he has no memory of becoming Oni-Chan and is just happy to be reunited with his sister. Despite the destruction caused by Oni-Chan, Ladybug and Cat Noir's quick thinking and teamwork ensure the city of Paris remains safe for another day.

"Oni-Chan" is a heartwarming episode that explores the dynamics of familial relationships and the importance of communication. It also showcases Ladybug's brilliance and Cat Noir's bravery as they take on yet another formidable foe. Fans of the show are sure to enjoy this action-packed episode full of excitement and emotion.