Time Police in Anime and Manga.
- Astro Boy, 1980 series: In "The Time Machine", Astro meets a time traveler from centuries in the future, who introduces himself as a member of the time police who has been attempting to track down a criminal who fled into the past.
- Doraemon: the Time Patrol often acts as The Cavalry in nearly every movie, since Doraemon and the gang have the unfortunate tendency to run into time-travelling villains.
- Flint the Time Detective: the main characters work for the Bureau of Time and Space, and were tasked with collecting all the Time Shifters who were scattered across time, despite being a couple of kids and an unfossilized caveman. This usually lead them to a famous historical setting where they would square off against renowned time thief Petrafina, who was collecting the time shifters for her own purposes.
- The Galactic Patrol in Jaco the Galactic Patrolman and Dragon Ball Super, as well as Beerus and Whis note that manipulating time is a grave crime.
- After the "Future" Trunks Saga, Bulma tries to secretly replicate the time machine her future counterpart made for Trunks. The replica is promptly destroyed by Beerus when he finds out.
- Sailor Pluto from Sailor Moon is the guardian of the Time-Space Door and attempts to prevent and regulate time travel and people altering the time line. It's not explicit how she got this job, though Queen Serenity gave it to her at a young age. In her case, her powers over time extend to even freezing it around her, but she herself is not exempt from these rules. In the manga, she actually dies after using this ability, which she describes as a punishment for using it. In the anime, it's pretty strongly implied that she does die in the anime as well, and her later appearance is actually an earlier point of time from her perspective. Wibbly wobbly, timey-wimey. In fanfiction, she tends to either abandon this role willy-nilly to ensure that the writer's time travel plot will work, or enforce it through extreme prejudice far beyond what she is ever portrayed as capable of. Particularly extreme fanfics portray her as a Machiavellian extremist that violently engineers the Crystal Tokyo timeline the series works on.
- Time Patrol Bon, another Fujiko Fujio comic adapted into a short OVA, where a schoolboy named Heibon in 1980s Tokyo unexpectedly meets a Time Police trainee named Ream and time-travels to a bunch of locations, from Feudal Japan to Ancient Egypt, to help Ream apprehend a time-traveling criminal. Towards the end of the OVA Heibon gets promoted to becoming another junior Time Patrol officer. Both the manga and OVA are pretty much forgotten nowadays, although Ream did have a cameo in the 2016 remake of Doraemon: Nobita and the Birth of Japan.
- Time Patrol Tai Otasukeman, the fourth installment in Tatsunoko Production's Time Bokan series. Both the two main characters and the villainous Terrible Trio work for the Time Patrol, whose job is to prevent alterations of history. Both the trio (which later becomes a Terrible Quartet) and the good guys have secret identities, the former as the Ojamaman, who try to alter history following the whims of a crazy guy in a green cloak who is nothing more than an AI created by their new fourth member, the real main bad guy, and the latter as the titular Otasukeman, who always manage to put everything back in place, so that we never see the Time Patrol actually do anything. Of course nobody ever discovers each other's secret identities until the very end.
- Vector Prime has this role in Transformers: Cybertron and, by implication, the entirety of the Transformers multiverse.
