Felix is a vampire member of the Volturi guards. His motivations are not at all described in the books. The only cues to discern his character are his physical actions and his talks to Bella and Edward.
In New Moon, Felix helps to hold members of the Cullen family while Aro, Caius, and Marcus deliberate on the decision on what to do with Alice, Bella, and Edward. His wanting Bella to stay in Volterra angers Edward.
In the movie adaptation, Felix and Edward enter a fight, with Felix winning, and almost killing Edward
Felix, of the Voltouri
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