it's not immediately apparent but Slipstream has a completely different head design from Nova Storm.
She has a broader jaw, and lacks the markings around her optics that Nova Storm has.
Speaking of eye markings, each of the seekers have different ones. Thundercracker's draw down from the bottom of his eyes and separate his cheeks entirely from his face, while Acid Storm's are points like Nova Storm's, except they point down from the inner corners of his eyes as opposed to the outer as it does with her's.
I dunno. It's a small thing but it's nice how they're using little touches like this to diversify the Seekers.
"Disabled people don’t have special needs. We have very reasonable human needs. Our needs include freedom from abuse, violence, and mistreatment, the right to autonomy and self-direction, the right to represent ourselves, equal opportunity for education and employment, the right to accommodation, and societal inclusion and acceptance.
The need for accommodation isn’t a “special need”. It’s a basic human right. It’s a leveling of the playing field that allows us the same opportunities and chances as non-disabled people."
- Amethyst Schaber, http://neurowonderful.tumblr.com/