What are the names of 'The Powerpuff Girls'?

Which company does Wile E. Coyote buy his gadgets from? In 'Peanuts' TV specials, what is the name of Charlie Brown's dog? In 'A Charlie Brown Christmas', what kind of Christmas tree does Charlie Brown choose? In 'Dexter's Laboratory', what is the name of Dexter's annoying sister? In 'Gravity Falls', in which state is the town of Gravity Falls located? In 'Hey Arnold!', what shape is Arnold's head often compared to? In 'Rugrats', who is the bossy three-year-old cousin? In 'Arthur', what kind of animal is Arthur Read?