Freddy,(As You'd know if you either played Security breach or watched a Youtuber's Playthrough,But if you don't I will definitely explain) Is your Guardian and Father Figure Throughout the game,He protects you from the hacked animatronics by letting you crawl in his stomach,Kinda like a Mama Kangaroo with her joey,He is very caring and protective,And Niave he doesn't always seem to notice when somebody has ill will or intent towards him,But he can be serious when the situation calls for it,he can get angry,but it's more of a righteous Anger as he gets mad about others he cares about getting injured on purpose without the need for self-defense,So you wouldn't see him getting mad at Gregory but you would see him getting mad at Vanny for hurting Chica or Trying to get her disasembled for "Failing". He and Chica are very close,He's a father figure for the animatronics as well.
Hopefully this explains his character,And I wish you good luck!