Presents For 13yr old boy?

I'm guessing you live somewhere in europe then, i live in BC Canada, so i wouldn't know what guys are like in europe but maybe you could get him a book. A book of his favourite anime would be great, Cause i've heard people complaining that animes shouldn't be turned into episodes and that the books are a lot better. Btw, i don't think there's an anime called clash on titans, you were probably referring to attack on titan. I hope this helped!
(And i think there are some anime-comic books for attack on titan)