You have probably never heard of Mystek. She always stood out in my mind as a character who had huge potential, and yet was killed off stupidly before she got a chance to explore any of that potential.
The Ray was one of the comics I read voraciously in my teens, the story of a teenage boy who spent his whole childhood out of the sunlight only to discover upon the death of his ‘father’ that he didn’t have a rare sun allergy at all, but sun-based superpowers. Written by Christopher Priest (no, not that Priest, a different one), his comic was the perfect blend of comedy and angst that appealed greatly to my fifteen year old self, and it didn’t hurt that Black Canary made semi-regular appearances.
And then there was Mystek. She was introduced as a supporting/antagonist character in the Ray title (she figured out he was a meta-human from her sensors when he wandered into her Radio Shack and instantly cracked the secret identity he worked so hard to preserve despite having the same first name as his superhero identity). She later crossed over to Justice League Task Force, the junior super team of which Ray was a member, also written by Christopher Priest (seriously, not that one).
Barclay, or Seong (we were never told which of these names were real, and if so which was her first and which her family name – the “demon” Neron calls her Seong first but notes that she prefers to be called Barclay) was a snarky Asian-American teenager with a talent for making machinery do what she wanted to. She had built her own super suit with which to either cause havoc or fight crime, whichever most appealed on the day. Oh and yes, as it turned out, she was claustrophobic which made the whole mecha suit choice a little… retrospectively odd.