Oh no, sweetheart, you need to wear a costume or that Trickster will certainly hunt you down and eat you.

[He considers for a moment leaving her to it; He's sure she'll figure out something for a costume and if she doesn't, well... maybe that wouldn't be so bad.]

I'm sure you have had some ideas! Like maybe a dog, or a bunny?

[He can't hold back the grin at the thought of Toriel in a bunny suit. It is... certainly an image.]