Little Loshka

Name: Lololoshka, patronymic: Dave, last name: Felchenkov. He and John are twins, but for some reason they're not biological. He's a teenager of average height, wears a blue bandana with a black checkered pattern, and blue sunglasses. He has brown hair with sparse blonde streaks. He's quite active and can't sit still without getting caught up in something. He's hard to anger.

Name: John, middle name: Davey, last name: Harris. He and Lololoshka are twins, but not biological. He wears a black bandana with an orange checkered pattern, orange sunglasses, and a white coat like a scientist's, except for the pattern on the back. He has dark brown hair. He's charismatic and proud, often uses toxic language, and almost never lies.

A high-rise apartment in the center of the city, on the ninth floor. The apartment has a large balcony and several rooms.
Room 1: Entrance hall, just an entrance hall with a large mirror and a wardrobe
Room 2: A hall/living room with a large fluffy carpet, a bookshelf that serves as a wall unit and a reading table next to it, a black leather sofa, a large flat-screen TV on the wall, and a panoramic window on the side.
Room 3: A hallway with paintings and other entrances. Beyond the hallway is the balcony itself and a storage room.
Room 4: John's room. John has a large regular bed, a desk with a computer, a small chair by the window, and another desk with only chemicals and other "scientific" jokes, and a large closet blocking the view of the bed.
Room 5: Lololoshka's room, with a bunk bed underneath, a small closet and table (on which a laptop should have been), a panoramic window and its own small balcony with a grill, a large closet nearby, its own ball pit, a carpet in the shape of a track for cars, and a basket of toys on the balcony itself
Room 6: A large playroom filled with everything! There's a large ball pit, a second small TV, a swing resembling a woven chair, a punching bag, a comic book shelf, and even a hammock in the corner.
Room 7: Parents' bedroom, Lololoshka and John are not allowed to enter there
And there are two more bathrooms, one after the hallway and the other next to the rooms.