something...rare, special. does he enjoy music? if so, i would be hoping his favourite was an artist with a wide array of hidden bootlegs, lots of little heard rare gems to find, get a couple of them. same idea with books (some really old, antiquity, infinitely artsy, intruiging and labyrinthian) i find that things like this are very special and personal
are you sure he is...human?

i don't know
i would also consider, if he isn't at all human (

), as lor said something utterly ridiculous like a Teddy Bear in a Suit Wearing a Strap-On Dildo, a Rocket/Chemistry set with a Selection of Former President Dolls to Fit to the Rocket, i can't imagine anything more fun! (find them president dolls!
so, these presents will be completely weird and hilarious, i can't think of a better present. Oh, lots of Sex and Horror Movies too. sex while watching ...Elm Street should be fun, he could be freddy and you could be...Jason?

lol, i dunno, definitely sex, more specifically intimacy and romance though
but what do i know, i am a 15 year old, socially retarded idiot but...
