He always makes mess in the kitchen while baking, and makes Gil angry- after all, Emil won't be the one cleaning it up

Emil can shapeshift into a squirell. In this form he tends to be easily drawn by smell of food and tries to hoard it in various places.

He never makes tea for himself and drinks from Gil's cup instead. He does the same as a squirell, but then he usually steals his blueberry cookies too

Emil tends to shift into a squirrel while sleeping and curls up either on Gil's head or around his neck, like a scarf.

Emil is the only one (besides Otto) who actually eats Yuu's cookies. Everyone else is afraid to break their teeth.