there is no satan dude... so the whole concept is bullcrap, like chirstianity but that is beside the point.
u obviously have no clue about metal and it's different influences. by the way he dress he is gothik kid (+listen to nightwish for fuck sake which is gothik soprano voice based band)
satanist would be these guys but they are useless too since there is no satan:
http://www.youtube.com/watch?v=joEAb_y7ZYA
and emo he can't be since those guys dont smile and he obviously has a big grin in the second photo (and no molestation/cutting on hand or ass) and has many friends, while emo's are solitary creatures that dwell on sorrow and carrots
hope it answer question!