As found on ResetEra, It looks like the characters for Guilty Gear Strive's Season 1 DLC has been datamined, and they included some old favorites from the series. However, if you don't want any story spoilers then be warned, as the newly found characters after this sentence apparently contains story spoilers. Ready? Let's get started, then:
As seen in the below screenshot, the abbreviations found in the folder include ASK (Asuka), COS (Happy Chaos?), GLD (Goldewis Dickinson), Jam (Jam Juradoberi), and JKO (Jack-O' Valentine):

It was commented on in the thread that Jam has a cameo in the story mode, so potentially it could've been the case that that's why she's been found in the game. However, it appears that she has an altered model with battle animation data against "Giovanna, Nagoriyuki, and Anji, who are all newcomers to Strive". It was also noted that Jam is the only story cameo to appear in the datamined folders.
so i opened them up in blender to compare and this is aboslutely not the same model from XRD, either. I'm gonna see if i can find all the materials and set them up in blender for a proper compersion in a bit. #GGST https://t.co/e30GiIIvBe pic.twitter.com/sEpAoScDHf
— Somnus, of the Ludens (@belovedSomnus_) June 11, 2021
If you would like to check out the ResetEra thread, be sure to click here. If you would like to check out the individual who has been checking out the nitty-gritty info on the game, check out their profile on Twitter. For more information on Guilty Gear Strive, stay tuned to TechRaptor for more details.
Thanks, ResetEra.
What do you think about these leaks? Are there any characters that you want to play? Which is your favorite Guilty Gear game in the series? Let us know in the comments!