Actually, she is Divergent, which means that she has traits for more than one faction. According to the aptitude test, Tris displays equal aptitude for
Abnegation, Erudite and Dauntless. Divergent are threats for the factions, especially for the
Dauntless and Erudite. So, Tris has to be very careful, to pass the Dauntless initiation test and then to become a Dauntless member. Otherwise, she will be factionless, which means she will live homeless at the streets. Tobias Eaton is the 18 years old instructor of the initiates, who is also transfer from Abnegation. Tobias’ father, Marcus Eaton, is the government’s chef, and he works together with Tris’ father. Tobias’ nickname is Four, because he is the only one who has just four fears in the fear simulation. Erudite and Abnegation have conflicts; Erudite faction writes articles against Abnegation and they criticize Abnegation’s policy. During Tris’ initiation, Tris and Four come really close. Four helps Tris to complete successfully her initiation, without being perceived from the Dauntless leaders, that she is Divergent,