Who is the antagonist in Miramar by Naguib Mahfouz?

Tolba Marzuq serves as an antagonist to Amer, though, the two seem to have put aside their differences and enjoy stimulating conversation.

"A few days had brought us nearer to one another. The sense of companionship had gotten the better of the old political differences as well as the deeply rooted aversion of two opposed temperaments, though occasionally the buried differences would drift up to the surface, reawakening an ugly antagonism."