Striped Dragons come in a dazzling array of colors complemented by an intricate pattern of stripes. These bright colors and patterns help attract their favorite food, insects. Because their prey is so tiny, striped dragons must spend a large portion of their day eating. The color of the offspring is usually determined by the dragon’s mate.
Sirius belongs to an odd cult named 'Stripes of Hogwarts'. The cult members believe the colour of a Stripe says something about the character. Sirius believes he has to act brave and chivalrous because he is a red Stripe. The non-cult Stripes in Laura-Lana's clan take advantage of that shamelessly and make him work for them, by indicating he'd be cowardly or unchivalrous if he refused. Sirius doesn't like flying around any more than any other Stripe, but because he keeps being manipulated into it he is the best flyer among the Stripes in Laura-Lana's clan. All the exercise has turned him into the strongest Stripe of the clan, too.
Sirius has captured the interest of the black dragons in Laura-Lana's clan. They have started to teach Sirius battle tactics.