/jp/ - Otaku Culture

>>17607871
The female lead doesn't talk or show much emotion if possible because whatever she says has the ability to happen and emotional outbursts cause other disastrous effects. She communicates by writing things on a notepad usually. (although she's not the only or even remotely first character to communicate through writing things or even to have horrible voice powers [e.g. Marvel's Black Bolt])

It's pretty much the exact concept you have, yes. Even her saying something like the word "die" is enough to kill everything within 'audible' range.