Sandella has mint-colored skin with blue eyes, pinks lips, and brown eyebrows. She wears pink and blue eyeshadow with seafins and blue and pink dots around her eyes. Her pink hair surrounds her seahorse ears and reaches down to her hips. Sandella wears a light purple bodice with a purple vest over it. The vest has two orange seashells and white scallops on the side. She wears a skirt with a pink elastic band. The skirt has a jagged trim while being longer in the back. There are pink and blue corals against an orange background on the skirt. Sandella wears orange cowboy boots with a scaley texture for the soles and fins on the sides of the boots. She wars a purple cowboy hat and wears seafin bracelets.
- May 23, 2017: Mattel requests the trademark for Sandella Seahorse.
- September 20, 2017: Stockphotos are added to Amazon's page for Sandella Seahorse, providing the first look at the character.
- November 14, 2017: Sandella Seahorse becomes Available on Amazon.com