Phobos and Deimos are the two moons of Mars (also their dad), they are very small and cute 7 years old children, too cute, very cute, the cutest in the Solar System.
But even though they are physically cute, their personality says the opposite, they are not just naughty, they are crazy, they say grotesque, unpleasant, bloody, gloomy, sinister things, etc.,like: "We will eat you alive", and maybe they are capable of doing it
Deimos even escaped from the asylum, it's better to be careful with them