I mean the multiverse exists. If you really want to go that route just make him from another Earth.
Changing topics - anyone knows if we're getting another animated movie outside of their normal whatever you call it line? In previous years we got JLA Adventures: Trapped in Time, Batman Ninja, Batman vs TMNT, Scooby Doo and Batman The Brave and the Bold, the Batman Unlimited series, Deathstroke: Knights & Dragons, the Adam West '66 animated movies, and the LEGO DC Superheroes entries. They usually provide good entertainment, but not being a part of the normal line up they're easier to miss.
Clone Roy was a spy for the Light so they could infiltrate and destroy the League. Him being a clone in the show had a reason. In season 2, his only goal as to find the real Roy and as soon he found his original self, he retired.
There is no reason to create a clone of Roy Harper in the comics, and i think that after all he been through in the last years, having a clone is the last thing he needs.
DC: Dick Grayson, Wally West, Donna Troy, Yara Flor, Titans
Some of my favorite Mangas: One Piece, Slam Dunk, Fullmetal Alchemist, HunterXHunter, Vinland Saga, Monster, Berserk, Vagabond.
Current reading: Jujutsu Kaisen, Chainsaw Man, Spy X Family, Kaiju Nș8, Blue Lock, Dandadan.
I expect a Lego DC movie, they tend to come once a year and get announced a little late, but COVID and a renegotiation of Lego movie rights might have gotten in the way of that this time.
Also Jonathan Crane, AKA the Scarecrow, had a major role in Happy Halloween, Scooby Doo last year.