Just an odd, random thought I had while playing DCU Online.
I'm not talking about Bizarro-ifying Karen. No backwards talk and "Down, down, and Neeaaarrrrr!" stuff. Just the heat vision/cold breath swap. So instead of heat vision she's got ice vision. Instead of cold breath she's got fire breathing. And maybe fire breath would be her go-to move, unlike the other Supers who use the vision powers more than their lung capacity.
In part just because I love the visual of someone spitting huge fireballs. It's a fun image. Hell, it even parallels the circus influences in Superman. And in part because it'd be a interesting twist on Karen's status as a refugee from a dead universe. It speaks to how similar she is to her "cousins" while highlighting the fact that she's still different; even from Clark and Kara. She's even further removed from home.
Why would it happen? Who knows? It's comic books! Maybe this reality's sun affects her biology slightly differently, and it's only now finally starting to take effect. It does take a long time for Kryptonians to burn through a solar charge after all, and Karen had years of exposure to her reality's yellow sun built up. Or maybe Myx is a bastard and screws with her for kicks (sort of like what I'm proposing). Or maybe she gets exposed to a Bizarro virus and although she's cured, it leaves its mark on her in the shape of her changed powers. Who cares why it happens! Would it be a weird, fun twist that enhances the themes of the character, or is this just a dumb idea brought on by too much work, not enough relaxation, a little scotch, and bad decisions?