First off, sorry for the typo last page about the dates. I originally tried to make it 35 years in the future like Futures End, but I chose to make it 20 years in the future instead.
Now here's Batman Beyond's allies and rogues gallery.
Oracle-Maxine "Max" Gibson
Mary McGinnis and Matt McGinnis-Terry's mother and little brother.
Dana Tan-Terry's girlfriend
The Justice League-The previously mentioned superheroes in the last chapter.
Rogues Gallery (More or less your interpretation)
Blight/Derek Powers
Jokerz/Organization
Inque/Unknown
Shriek/Walter Shreeve
Kobra/Organization
Bane's Legacy/Unknown
Black Mask 2/Unknown
Clayface/Basil Karlo
Deathstroke 2/Rose Wilson
Hush/Clones of the Bat Family
Man Bat Plague
Mr. Freeze/Victor Fries
Talia Al Ghul
Solomon Grundy
Owlman/David Salter, a result of project BATMAN BEYOND, like Terry. But he took a much darker path, having used his genetic traits to be an assassin, working his way up in power till when he came to Gotham, he took it over in one night.
Joker-Before Batman's back was broken, the Joker had contracted cancer in his colon, kidney, pancreas, prostate, and seven separate tumors. This is what lead to the torture of Jason Todd, who he implanted with mole like machines that he stole from Cadmus Labs (a prototype project BATMAN BEYOND) and inserted it into Jason's body, slowly rewriting Jason into a clone of the Joker. And once the Joker did die, Jason then unconsciously started infecting the rest of the bat family (Minus Vincent, Mar'i, Mickey, and Terry due to them having been considered too young). And so, the Joker has secretly made the Bat Family into the new Joker Family.
Anybody played Arkham Knight yet?