Early Life
Nathaniel was born on a leap year, and while he was born before his sister (technically making him older) Ella was born on March 1st, allowing her age to progress with the natural calendar. While Bridge Carson is his biologial father, it was as a result of time travel when Bridge visited 2007 for a mission. Because of the unique situation, he is given the opprotunity to grow up with his father during his childhood years. Later, his mother adopted an orphan, Sam, who becomes his brother and eventually "puts the bug in his ear" to want to join SPD. Nathanial ends up with his father's last name, while Ella uses her mother, Alyssa Enrile's maiden name, Enrile.

After a shift in the timeline, he returns to his own time to discover his mother is married to Patrick Harris, and together the two of them have two children. SPD Career
Nathaniel is natually curious and is proficient at almost anything he sets his mind to. He hates to be told no, or that there is something he cannot or should not do, and will often do it in spite of the consequences. He is encouraged early on to pursue his feelings for Serenity, by his sister. During Truth and Purpose, Serenity is forced to reveal she is from the future and that she does have an interest in Nathaniel. Ella seemed to have a personal bond with everyone, especially Garr, who found her interesting. Serenity sacrifices herself in Closure, and Ella is originally against her brother trying to mount a rescue mission, but later gives in to him. She also feels a special closeness to Patrick Harris, who she credits for risking his life to save the D-Squad.