Actually, I wish more of the newer characters got in as well as more original characters than legacy characters. I don't feel this way about most fighting games series, but the new characters Arc Sys have been making since Xrd have been really good and some of the last ones added to Xrd in Rev 2/Rev2 DLC barely got to be used and would've been nice to have them from the start this time.
Looked it up and these are all the characters missing from Strive (6 left to be announced for Strive tho):
GGXX characters
1. Johnny
2. Venom (kinda surprised Venom didn't make the cut)
3. Jam
4. Dizzy
5. Slayer
6. I-No
7. Baiken
GGXX Characters that never made it to Xrd
8. Testament
9. Bridget (wow, just realized Bridget never made it to Xrd)
10. Zappa (same w/Zappa)
11. Kliff
12. Justice
13. A.B.A.
14. Robo-Ky
15. Order-Sol
GGXrd New entries
16. Sin
17. Raven
18. Bedman
19. Elphelt
20. Jack O' Valentine
21. Kum Haehyun
So if every single character from the past made it to Strive, the roster would be 35 total characters.
I wonder if the last 6 reveals will be 2 all new characters + 4 more returns (probably I-No/Slayer/???/???).
There's definitely enough backlog characters to make another 3-4 games of Strive, but Xrd Rev 2 bombed hard as fuck which is why we didn't get Rev 3 which would've probably added Zappa/Bridget/Testament. If Strive bombs too, good luck even getting a 2nd game out of this. I have zero faith a reboot will save Guilty Gear. It's a niche fighter and fighters are pretty niche again in the first place. Luckily Arc Sys making that DBZ / Granblue money, otherwise I'd be worried they'd even stay in business with how bad GG sells and Blazblue being over.