Bubblespitter

Bubblespitter is the villain identity-name a female human took on. Living on Earth 03, her outfit is black along with a black coat. Using a device she carries on her back and tubes that go up to her lips, she can make acid bubbles that burn through flesh, stone, and metal.

To combat backfiring (e.g. bubble pops and sprays her) and so she can actually make the bubbles, she has made a ointment that will make sure she will never get hurt because of it. Also, once applied, this effect lasts for years. She closely guards the secret so she is not taken advantage of.