So...I'm thinking of having Luca hork down a bunch of candy and having a multitude of effects all at once

Like several animal parts, amnesia, paranoia, singing

And someone can encounter a still bleeding Luca (from him going crazy with the blood offering) crouched over a pile of candy like a candy dragon

Half corrupted from the paranoia

But a big circle of candy around the mess from him setting aside one piece of candy intending to give it to each of his housemates

LUCA

Who he no longer remembers from the amnesia candy

Teeff What? A strange mysterious beast offers you candy, what are you going to do? Not get as much as you can out of the encounter and devour it?

you don't eat all the magic chocolate Luca!!!!

Clearly he does!

Also I have decided to have little bits of memory crack through the amnesia at moments then fade

zib, taking notes: fascinating

Maul, over here sighing and reminding himself that THIS is the reason he never wants to have children.