Who are Ladybug and Cat Noir?

Ladybug and Cat Noir are two superheroes who were given a miraculous by the guardian of the miraculous, Master Fu. They must keep their identities a secret from each other. They were given the miraculous so that they could protect Paris from an evil villain named Hawk Moth. Ladybug is Marinette and Cat Noir is Adrien. Ladybug and Cat Noir blindly love each other. Marinette likes Adrien and Adrien loves Ladybug. Hawk Moth is actually Adrien's dad, Gabriel Agreste, who is a famous fashion designer, who uses his son as a fashion model. The summary is: 

In modern-day Paris, teenagers names Marinette Dupain-Cheng and Adrien Agreste transform into superheroes when evil arises. Marinette transforms into her superhero persona Ladybug, while Adrien transforms into his superhero persona, Cat Noir, using magical jeweled objects known as the Miraculous. Not knowing each other's true identities, the two work together to protect Paris from the mysterious villain, Hawk Moth, who covets and attempts to steal their powers by using his Akuma, butterflies infused with negative energy, to transform Paris' everyday citizens into supervillains through a negative emotion that they have recently felt or are feeling.

The first season ends with Marinette meeting Master Fu, the Guardian of the Miraculous, the man who gave Marinette and Adrien their Miraculous. The second season opens with Hawk Moth's identity being revealed as none other than Adrien's father Gabriel Agreste. It is also revealed that his motive for wanting to take Ladybug and Cat Noir's miraculous is to combine them, which would allow their user to use their ultimate power to make a wish come true which can alter reality. Gabriel's wish is to heal his wife, who is in an eternal sleep after using the peacock miraculous. This season also sees Marinette under Fu's tutelage, learning about the Miraculous. Circumstance requires Marinette to loan various Miraculous to friends and allies to fight some supervillains for temporary purposes. These allied heroes are called back at the season's end when Hawk Moth manages to traumatize over two dozen civilians. The heroes are victorious, but Hawk Moth manages to escape with the aid of the Peacock Miraculous holder Mayura who turns out to be Gabriel's assistant Nathalie. Later on, Marinette and Adrien also share an intimate moment at the park.

Hawk Moth continues his campaign in season three aided by the help of Mayura and her Sentimonsters, creatures created from charged feathers called amoks. Marinette calls upon even more allies to become Miraculous heroes while her nemesis Lila allies herself with both Gabriel and Hawk Moth, unaware of that the two individuals are the same person. Two plot arcs include Nathalie's failing health from using the damaged Peacock Miraculous and Ladybug's refusal to give the Bee Miraculous to Chloe, leading her to betray Ladybug and side with Hawk Moth. By the end of the season, Gabriel gets the information he needed from Fu to repair the Peacock Miraculous while Fu's guardian status is passed to Marinette.