Zel's already been fourth-walled and has indeed watched quite a bit of Slayers, so there's no problem at all with her knowing about it. If she brings it up in front of him, though, he'll probably come right out and ask her not to spoil him for anything after TRY, because he hasn't watched the new seasons yet and is wary about doing so.
She can also just as easily have a Precureverse TV show based on Slayers. He tends to actually find those a little amusing. I have no idea what it'd be called, though XD
Jak is from an American video game, but it's entirely conceivable that she's played it anyway. She's free to have done so.
I do want to ask that she not fourth-wall Butterfly, though whether she's read Discworld is up to you. Especially since Butterfly is technically pre-canon (though I'm going to be starting it up next month).
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She can also just as easily have a Precureverse TV show based on Slayers. He tends to actually find those a little amusing. I have no idea what it'd be called, though XD
Jak is from an American video game, but it's entirely conceivable that she's played it anyway. She's free to have done so.
I do want to ask that she not fourth-wall Butterfly, though whether she's read Discworld is up to you. Especially since Butterfly is technically pre-canon (though I'm going to be starting it up next month).