Beatrice or Tris for short is a abnegation born girl, but she has troubles being selfless like she has to be, so she contemplates switching factions when she gets the chance.
Erik Is the main anatagonist hes the leader of the dauntless and he suspects that Tris is divergent so he doesn't like her, and he also doesn't like Four.
The theme is you can be whatever you want, Tris was born as an abnegation girl but she didn't feel like she was supposed to be in the abnegation so she switched factions to what she felt suited her, which was the dauntless
"can i be forgiven for all iv'e done to get here?" "I don't know. I don't know" (476) we don't know if Four is going to shoot Tris while hes brainwashed or if he will come to his senses and realize whats happening
"Mom" I say, my voice strained "You were dauntless" "yes" she replies this is showing irony because for all of her life she thought her mom was abnegation and now that shes dauntless she can protect her daughter. (440)
"heat swells from behind my eyes as i think of home" Tris is upset because she has to sleep near all these people she doesn't know and its the first day of transferring and she doesn't know what's really happening. (73)