Do you think Tirio is more Takunami or American? Do you think Tirio will want to stay with the Takunami tribe or return to America with Sara?
I believe that Tirio is more Takunami than American because he was born a Takunami, his first ways he was taught were Takunami and he even speaks the language. I also think he is from this tribe because the spirit that drives him to prove his Paho wrong is not his American spirit, it is his native spirit that was partially taught by his American one.
For example, on page 129, he says: "If I'm right- and I'm pretty sure I am - I just stumbled into a caiman's underwater den." I used this quote as an example, because an American boy, in the dark, would not just automatically know that he had just entered a predator's den, only someone who had already known the jungle the way Tirio does.
I do think that Tirio will stay in the jungle with the Takunami to partially bring shame over his father for outcasting him from the tribe and also to show his ability to be able to become a Takunami warrior, to show that yes, he was outcast, but when he came back, he came back with the capability of not only being a warrior physically, but he is a warrior in his soul.