The first poster is correct in that he is both. Neither side dominates his personality; that's why he struggles so much with his identity. Tony’s mother’s family are farmers, and the founder of their family was a priest. This is perhaps where Tony's love of school and learning comes from, and his attempts to understand the nature of God. Tony’s father’s is made up of vaqueros who love the freedom of the land. His father doesn't expressly say it, but he certainly encourages Tony to feel that freedom too. Tony's mother, on the other hand, is determined for Tony to become a priest.
The end of the novel proves that Tony is able to reconcile those two halves of his soul. In fact, that is the most important aspect of his relationship with Ultima. She is a curandera, a healer-and she succeeds in healing the torn Antonio. He chooses not to be a priest or a cowboy, but instead to follow Ultima in the path of a healer.
Neither. Antonio has Lunas blood so there for he can not be purely Marez and he has Marez blood so there for he can not be purely Lunas. In the end he does not have to choose between the two. "Then maybe i do not have to be just Marez, or Luna, perhaps i can be both"
He is definitely more of a LUNA, not Lina. In spanish Luna means "moon". Anyway, he is definitely a Luna. Although the repreated motif of him being a little of both the Luna blood is more prominate in him. He picks the pen and paper for the life tools, as well as how he proforms at school. Most likely, the anwser you'r teacher will want is that he is both.