I am Tina, this is my younger brother, Max, and here is our friend, Cosmo. We live in the city of Aeronaut, high in the clouds. Our city flies all over the entire sky, from one end to another, back and forth. We do go to school, like you; but often, we set out on expeditions to seek adventure.
Tina
Tina is 10 and she is a beautiful blonde girl with brown eyes. She is orderly, does well in school, and her favourite classes are gym, geography, and art. In math, she relies on her brother Max. She often exchanges letters with her friends from various countries. She also loves solving mysteries, and sets out to seek adventure with Max, Cosmo, and other friends. When Max sleeps over (which really is every day), she outs Cosmo in the morning. She always wears a communicator on her wrist, which she got from her parents, so that they would know where she and Max are.
Max Max is 6 and a half, and has black hair and eyes. He likes to dress like a pilot, and he very much looks forward to when he is grown up and able to pilot a real plane. For now, he has only just started school. He is good in math and has good ideas about how to solve various mysteries. He's got ants in his pants, and has lots of energy. He is always in a good mood, but sometimes he is a bit of a scatterbrain. He likes to sleep-in, in the morning, and often does not have time to take his dog Cosmo out. From time to time, he wanders off absentmindedly, and no one knows where he is. Lucky that he has his older sister, Tina, who always knows what to do.
Cosmo
Cosmo is a large white dog, who belongs to Max, but often Tina takes care of him. He is a clever friend of both children, who often gets them out of trouble. He would prefer to only lie about and sleep, but his human friends are always taking him on their adventure-seeking expeditions. It's no wonder, either: Cosmo is an excellent guard dog and tracker, is always in a good mood, and on top of that he can tell when someone is not telling the truth, which does come in handy!
Tina 
Max
Cosmo 