Here's what I'm thinking of.
Matilda Lark was artificially created by OmniCorp as part of Project Omni-Men, which was an attempt to create, market, and most importantly, control their own superhero team. Her DNA was a mix between stolen samples from two prominent heroes, Brainstorm (superintelligent gadgeteer hero) and Teknomancer (technopathic hero). While Matilda displayed signs of Brainstorm's superintelligence, the technopathy from Teknomancer was unstable. Some days, she could hardly turn a television on and off, and other days she'd be subject to an overwhelming amount of feedback from the technology within her range. This drove her to create the nanoimplants that would regulate her technopathy.
She and four other similarly engineered supers were put through grueling training (and programming) before debuting as the Omni-Men. She went by Machina, serving as the 'brains' of the team. However, she grew unsatisfied with being under OmniCorp's thumb, so she escaped and went off the grid. She told herself that she couldn't have helped the others, their programming went too deep. However, the guilt ate away at her, so she emerged from hiding to be a hero again, taking great care to reinvent herself and hide her true identity. She's been moving from town to town, spending the majority of her hero income on her power armor while also secretly striking at OmniCorp in ways that she could get away with. She came to Small Town because of the rumors about the
OmniCorp cell phone factory.