Boys would usually have quite messy hair, which even though would probably be in some sort of side-fringe, would be nothing like scene/emo hair. Boys would also probably wear rocker jeans, converse and rocker t-shirts.
Girls would have wavy, rocker hair, also maybe in a side-fringe, but not like scene hair, which is usually high-lighted. They would wear denim skirts/jeans, rocker t-shirts and converse.
Indie rock kids are usually happy people, that don't care what others think. However, some indie rock kids could be depressed, but they would still have the I-don't-care attitude.
Indie rock kids would listen to:
-> Rock (but not modern emo rock)
-> Alt. rock
-> Some alt.metal (but not emo/gothic metal)