An automatic waterproof cover children umbrella typically possesses the following characteristics:

1. Automatic Opening and Closing: These umbrellas are designed with an automatic mechanism that allows for easy and quick opening and closing. With the push of a button, the umbrella automatically extends or collapses, providing convenience and ease of use for children.

2. Waterproof and Windproof: Children umbrellas with a waterproof cover are designed to keep the rain off, keeping the child dry. The waterproof material, often made of nylon or polyester, prevents water from penetrating the umbrella's canopy. Additionally, some umbrellas may have windproof features to withstand gusts of wind without flipping inside out.

3. Child-Friendly Size: Children umbrellas are typically smaller in size compared to adult umbrellas, making them more manageable and easier for children to hold and carry. The canopy diameter is usually designed to provide adequate coverage for a child.

4. Sturdy Construction: These umbrellas are built to withstand the wear and tear of regular use by children. They feature a sturdy frame made of materials like fiberglass or metal, providing durability and resistance to bending or breaking.

5. Safety Features: Child-friendly umbrellas often incorporate safety features to minimize potential hazards. These can include rounded or covered tips on the ribs to reduce the risk of injury and a smooth opening and closing mechanism that avoids pinching fingers.

6. Colorful and Fun Designs: Children umbrellas often feature vibrant colors, patterns, and fun designs to appeal to children's preferences and make the umbrella more visually appealing. Popular designs may include cartoon characters, animals, or other playful themes.

7. Lightweight and Portable: Children umbrellas are designed to be lightweight and portable, allowing children to easily carry them in their backpacks or bags. The materials used in construction contribute to their lightweight nature.

8. Comfortable Handle: The umbrella handle is typically designed with a comfortable grip suited for smaller hands. It may have an ergonomic shape, a non-slip surface, or even a kid-friendly design like a character-shaped handle.

9. UV Protection (Optional): Some children umbrellas may offer additional features such as UV protection in the canopy material, helping to shield children from harmful sun rays during sunny weather.

It's important to choose an umbrella that is appropriate for a child's age and size, considering their ability to handle and operate the umbrella safely. Adult supervision and guidance are still recommended, especially during adverse weather conditions.