Roger Peralta is Jake Peralta's father. He walked out on the family, when Jake was seven, and has since reappeared infrequently in Jake's life.
Throughout the SeriesEdit
In Captain Peralta, Jake's dad gets in touch with Jake, much to his excitement. Roger takes Jake out to dinner, and it is revealed that the only reason got in contact is because he is being accused of drug possession. Jake, Charles and Scully fly to Quebec, to find out who framed Roger. However, Roger is arrested upon arrival, as they find drugs in his apartment. Jake realises that Roger's girlfriend and mistress both had access to his apartment, so they could have framed him. Roger is found innocent, but doesn't turn up at the celebration party that Jake had planned for him. Jake goes and confronts him, and tells Roger that he doesn't want to see him again.
In Karen Peralta, When Jake and Amy visit Karen Peralta, Roger arrives and Karen announces that they are seeing each other again. Jake tries to break them up, but later sees that Roger genuinely cares about Karen, and agrees to let them be.
Roger is shown to be untrustworthy, and often uncaring towards other people's feelings ,such as cheating on his partners and not being considerate about Jake. However, Karen claims that he does have a more sensitive side, as he cared for her and brought her soup when she was sick.
Jake is shown to be very distrustful of his father, and he is unwilling to accept his father back into his life after numerous betrayals. Jake tells Charles that it's not blood that matters, as Roger has never been there for him, and he doesn't view Roger as his father figure, instead seeking a father figure in Holt.
Roger and Karen broke up because he left them, and also due to the numerous times he cheated, including with her best friend. Despite this, Karen is willing to look past it, and the two start dating again later in life. Karen tells Jake that Roger really cares about her now, such as when he flew in on his day off and brought her soup when she had bronchitis. 
Not much is known about their relationship, other than the fact that he only visited her about 9 times throughout her childhood, one time sending his co-pilot, Steve, who taught her how to shave.
- He coached Jake's little league baseball team.
- Flies internationally from Albany to Quebec for Tribute Airlines.
- In Hostage Situation, he appears as a potential sperm donor for Charles and Genevieve.
- He said he’s had sex with about 400 women