In Rumble Fish, what is a description--physical and mental--of Rusty-James? How is he different from other characters in this book?

Rusty-James is the first to admit that he is not the
smartest guy around. He doesn't understand much of what his father tells him, nor is he
the brightest of his own gang. He prides himself on being tough, and he shows no fear in
individual or gang fights. We know he is a fairly attractive guy, because he looks much
like his glamorous brother, the Motorcycle Boy, who is described as having "wine-colored
hair and midnight eyes." Rusty-James wonders if he looks anything like his mother, too.
He is fairly tall for his age, since Biff--who is two years older--is about the same
size. He has several scars from injuries and knife wounds received during fights. Though
he doesn't admit it, Rusty-James is an emotional wreck, stemming in part, according to
his brother, from when their father left him alone for three days as a child. He hates
being alone, and he usually surrounds himself with fellow gang members or girlfriends.
He worships his brother, the Motorcycle Boy, and he obviously missed his presence while
he was absent (in California?) for two weeks.