Cadence

Echo is an advanced Shell, being not only the first Shell with the ability to think for itself but also the first to use Parodies. Though not a member of the Dark Matter Resistance, she often works towards a common goal alongside them.

Appearance
Like most Shells, Echo's appearance mimics that of a Popopo in most physical aspects. She is dull gray in color, with darker feet and short-cut hair. Her eyes are normally blank white and lack emotion, but take on the color of her active Parody when in combat. She is also often depicted wearing black headphones.

Abilities
As a Shell, Echo's natural element - Noise - is unrefined to such a degree that it is impossible to control properly. However, she is an expert at channeling Parodies, and is capable of actively summoning them in battle and channeling their power into her own physical attacks. For example, by channeling her initial Parody - Polymnia, a Light/Sound elemental - in battle, Echo can amplify her hand-to-hand attacks with blasts of sound, producing a shockwave effect that can damage multiple foes, or blind foes with bright light. She can also summon Polymnia herself to attack with a lyre.

Backstory
When the first Shell - Achro, a prototype of Black using some different and very imperfect methods - came into being, the Reaper's City automatically spawned Echo into existence. It made sense, really - it was innovation. A new species of Popopo. While Achro found himself slave to Pink's manipulation, never being left to his own devices long enough to develop naturally, Echo was left on her own to explore an empty world.

Eventually, Echo developed enough to warrant attention from the Reaper's City proprietor, Tempo. Tired of the lack of attention on the surface realm and seeking something new and excited to earn him the fame he needed, he enlisted Echo to help him with some issues...

Personality
Echo, being without a soul, technically has no personality. She is bland and boring, having no interests of note save for music. Even then, she listens to it simply as an excuse to ignore others and evade conversation.

Tempo
Echo regards her boss' shenanigans and excitable nature with the closest thing she could get to annoyance. She often finds him far too talkative, but nonetheless acknowledges and respects his power as God of Imagination.

Achro
Echo sees her older brother as a wasted opportunity. Were his mind not constantly occupied by the meddling wills of fiends like Pink and Shadoo, he would have developed his mind ages ago, and those occupying Zolara's living realm could have learned how incredible a force the Parodies were.

Pink
To Echo, Pink is nothing but bad news for the future of the Shells. If Pink learned how to replicate the Shells, she would almost certainly build an army of braindead vegetables like Achro and use them to conquer the world. Echo sees that as a waste of innovation, and tries to stop Pink's schemes whenever possible.