I'd be interested in an ongoing series maybe called VIBE(S)
Have ...Cisco(Vibe) gradually understand and honing his powers, not just vibing where he can "see" other dimension/timeline events, but eventually being able to physically vibrate between them all, becoming an actual breacher able to navigate them at will.
The temptation of being able to constantly jump between them, choose one to live in forever, or to change influence one to his liking, where everything is "perfect", extract things, effect events he does like, doesn't like from one to the other.
Effect his own time-line/dimension, almost creating his own timeline dimension as he wishes out of everything out there, imagine the power, the potential, and
the danger.
Being aware off all the possible alternate realities/timelines, not just good ones but horrible ones as well, like a constant vivid dream he Vibes, I imagine would be quite overwhelming.
Almost frightening. (as they've hinted on the show)
Even further, I'm talking more crazy ones, like a reality where dinosaurs became the dominant species on Earth. Or Atlantis or the Amazons were the Rulers, where the Nazis won WWII, etc.
Anything available from the Comics multiple Earths and more.
It would all be his beautiful but also terrifying playground.
How does it affect (for better and worse) the "real" timeline, the one he left, the one he entered, the one he created by entering it, etc. And how does it effect him, his own conscious if his "reality" becomes so mutable?
It's all probably too much for the TV show (where he isn't the focus), but it can really play out in a comic.
There's a great theme and visuals that works for the comic character, and they've hinted at it, but dropped it.
Combined with Cisco's fun TV character and personality at the heart of it, I think it could really work.