i dont consider storm to be iconic, but if she is, then so is cyborg.
BP only became iconic through the movies, and as we all know, DC struggles more when it comes to movies, so they are not nearly as likely to succeed at making a black character iconic through films.
Cyborg is popular due to Teen Titans Go now if anything. If someone were to say name the X-Men, Storm's name would come up pretty damn soon. Asked to do the same with the Justice League and Cyborg aint getting mentioned near the top if at all.