Thus far, all the known characters who has been named in the Uprising universe are as follows:
Blackarachnia
Nightscream
Scavenger
Immorticon
Optimus Primal (deceased)
Cheetor (damaged)
Rattrap (presumed dead, but evaded death)
Silverbolt (deceased)
Rhinox (deceased)
Depth Charge
.X Rampage
Trans-Mutate
Dynobot
Jawbreaker
Botanica
Geckobot
Torca
And of these, the ones that we know what they look like are:
Rattrap
Depth Charge
Rampage
Trans-Mutate
Dynobot
Jawbreaker
Botanica
Geckobot
Torca
And, well,
technically we have seen Blackarachnia, Nightscream, Scavenger, and Immorticon as well, but only in the bodies of their TransTech counterparts, which they stole. So we don't know what their original bodies looked like before they jumped from the Uprising world to Axiom Nexus.
And of the ones who have visual references, only Depth Charge, Rampage, and Trans-Mutate are confirmed to be getting official toy releases (though, a few others like Dynobot, Botanica, and Jawbreaker have been made into unofficial fan customs).
So these visual ones have the best chance of being made into toy form, being based off actual toy designs.
P.S. - As for why the known characters have so many named Maximals vs. so few named Predacons, it's because they're not all part of the same allegiance. Several of these Maximals turned on their fellow Maximals who were still loyal to the Autobots, and these deserters joined up with likeminded Predacon deserters to initiate a rebellion. And of these known characters, the following are members of the resistance:
Blackarachnia
Nightscream
Scavenger
Immorticon
Cheetor (original leader)
Rattrap (current leader)
Trans-Mutate
Dynobot
Jawbreaker
Botanica
Geckobot
The rest either remain loyal to their Autobot masters or were killed prior to the resistance began. As for the deceased, Primal remained loyal and was killed by the rebels, while Rhinox and Silverbolt were killed in action before the rebellion started (Rattrap was thought to have died with these two, but he survived).