I keep a light up plastic sword beside my bed for this very reason. The same fun for a tenth of the cost and it hangs nicely on my towel rack while I pee.
I know she's a hunter, but lets be honest, she's done more magic in this last season than Ikora has in the last couple of years. I say let's make her an honorary warlock.
It can't roll off the counter and provides improved illumination for guys to aim. For ladies, they can sit with confidence that the seat is down and there are no spiders. Then, it is gently rinsed by the flush afterwards.
Maybe it could set on the towel rack. Idk. That'd be my first concern also. Even after cleaning my own bathroom I assume aerosolized germs are everywhere and carry nothing in there that doesn't belong there.
White/Blue light is a fucking terrible choice for something like this. Blue light makes you more alert and reduces quality of sleep, so you'll be more tired than before you had this.