Translation of "el diablillo" into English

Si no, te quedarás aquí con los diablillos a contar estrellas.

If not, you'll stay here with the gremlins and count the stars.

Hablaba de mi amigo, el diablillo de la botella.

I was talking about my friend, the imp of the bottle.

Mira cómo se mueve, ¡ el diablillo! .

Look at him wriggle, the little terror!