Why did Custard cry for a nice, safe cage? Why is the dragon called a “cowardly dragon”?

Custard cried for a nice, safe cage because it was a coward. It is called a ‘cowardly dragon’ because everybody else in the house was brave. Belinda was as brave as a barrel of bears. Ink and Blink are described as so brave that they could chase lions down the stairs and Mustard was as brave as a tiger in rage. Compared to them, Custard cried asking for a nice and safe cage, which is why it is called a coward.