Alright time for the part where I look back at prior Dreamworks game crossovers for hints only for them to amount to nothing:
Madagascar Kartz - Mostly just Madagascar characters, but Shrek and BOB were also playable as guest characters
Dreamworks Super Star Kartz - This game had the Shrek, Madagascar, How To Train Your Dragon and Monsters vs Aliens franchises crossover, it had the following roster:
Shrek - Shrek, Donkey, Fiona
Madagascar - Alex, Marty, Skipper
HTTYD - Hiccup, Toothless
MvA - BOB
Weirdly enough the DS version of the game had a bunch of exclusive characters, but all of them were only from Madagascar, those being Gloria, Melman, King Julien and the two monkey characters Phil and Mason (they share a kart)
Finally that leaves the big one, this one being a mobile game:
Dreamworks Universe of Legends (released in 2017)
This mobile game has a whooping 40+ playable characters, but I’ll try my best to name as many as I can find
Madagascar: Alex, King Julien, Marty, Mason, Maurice, Makunga, Nana, Skipper
Shrek: Shrek, Donkey, Gingy, Three Little Pigs, Lord Farquaad, Pinocchio, Snow White (how tf was **** in Boots never in these games…)
Kung Fu Panda: Po, Mr Ping, Tai Lung, Tigress, Monkey, Viper, Commander Vachir
HTTYD: Hiccup, Toothless, Astrid, Stormfly, Eret, Hookfang, Tuffnut, Ruffnut, Barf & Belch
The Croods: Eep, Guy, Chunky, Douglas, Punch Monkey
The rest: Megamind, Jack Frost, Turbo, Mr. Peabody, Sherman
Of course nothing is set in stone and with how few Dreamworks crossover games there have been it’s very hard to gauge anything but still figured it was worth bringing to discussion