Tokusatsu series need HUGE amounts of cleanup
Tokusatsu TV shows like Super Sentai (and the American adaptation, Power Rangers), Kamen Rider, and Ultraman are currently a HUGE mess on Trakt. From TVDB, they have season entries for each series under the main entry. There are also individual shows split out from these that have separate entries, likely imported from TMDB (some deleted at the source).
I simply can't take the time to go through and list all of them—there are 20+ seasons of EACH that I'd need to look for, and I don't know the franchises that well. But they do need attention. I'd wager money on these shows being the largest single source of duplicate listings on Trakt.
But you'll need a lot more info than I can give you. I will try to recruit someone who knows this stuff to make up a list for you and get the duplicates removed from the other databases. Fair warning, though: it's not going to happen quickly. There are literal decades' worth of shows to check.
Maybe just having this open will attract the needed attention, too, who knows?
Any more specifics so I can clean this up? Direct links and info would help me figure out what is incorrect.
I'm not familiar with any of these shows myself, so ideally if there was a list of shows that need to be removed (don't exist on TVDB) then that makes it much easier to deal with. Same thing with other data that might be incorrect like bad seasons under the shows. Lastly, as you know the data will need to be updated on TVDB and TMDB before I can fix anything on Trakt.