Originally Posted by
Güicho
...Rhonda Pineda is out there (missing maybe hiding, trapped, struggling, etc. with the discovery of her own power) , and recruits Choi and potentially other Atom legacy themed characters, to try and find her.
Setting up the theme and adventure for a first arc and the launch of the Atoms, Atomics, Team Atom book.
Further, another way to approach her powers as somewhat unique, is the idea in quantum mechanics, that Atoms can be in two places (or take two paths) at the same time.
Extrapolate from this to develop the journey to find her, and define her powers as unique, theory being: when on a quantum scale she can be in several places at the same time, and everything that implies for the character.