SpringTrap is an old animatronic left to rot in another Fazbear company building. He has somehow reached the others and seems to know them. He can hardly speak and needs to be repaired.
SpringTrap hates some of the crew because of major malfunction. He also likes to smoke and do other drugs as they stop the pain of disrepair. Xira seems to be his only friend at the moment.
Mostly Xira and others who help him. When he gets back on his feet, he will be willing to find any woman to have a short term relationship with and mabe even a longer one.
Balloon Boy and mostly others who disrespect him. He will hate other things aswell.
In SpringTrap's mainframe code, there are voice recorded audio logs made by himself. Nobody has ever found them before so he keeps them secret.