The power to remove the internal dialogue from any anime I'm watching

You have a runny nose pretty much all the time

You can only instant kill on command by saying their first name with intent to kill them. However, if you do, then everyone who shares that first name also dies.

For example, if you were to use your instant kill ability on some guy named Dave, then all Daves in the world also die.

You also get severe sleep apnea

That will slander you if you ever speak out against her, that is.