Selena has purple eyes and very long straight black hair, has features like single sidelock (left side), blunt bangs, colored inner hair (blue or red inner), hair parts into two at the lower back. Her hair is adorned with a single hair ribbon on the right side, wears a pair of earrings.
The Tempest frame has many mechanical parts and elements integrated into the body, she can be tagged as cyborg depending on the level of mechanical details depicted. Both arms are mechanical as well as her left leg (single mechanical leg), both feet are mechanical, but depending on depiction, right foot might look like a black boot (asymmetrical footwear). Has robot joints at her elbow, wrist, knee and ankle.
Depending on awakening level of the character depicted, her hair ribbon can be replaced by two hairclips, and her skirt armor plates can be depicted glowing. She uses a weaponized cello in combat, but the acoustic chamber is missing entirely, and the endpin is a blade. Also carries the bow to play the cello.