I've had several plot ideas for SG versions of Beast Wars and Beast Machines, but aside from at least half of them not having beast mode color schemes yet, let alone bot mode ones.
I still don't have personality ideas for all of them either. Imo they should be as opposite as possible while still making sense in-universe.
SG Inferno is very anti-authority, maybe even a punk or an anarchist. He often butts heads with Megatron, and if he thinks his plan is better than what the others are currently doing, he'll put it into action which obviously creates problems. He's pissed that the Maximal elders tried to control him with programming (which Tarantulas removed before the protoform activated).
SG Tarantulas is a calm, gentle team mom.
SG Transmutate is very distrusting and defensive when she joins the Predacons, since the Maximals openly wanted to kill her (though Transmutate eventually opens up to the Predacons). She's also often frustrated with how she has a hard time with things that are clearly easy for the others.
SG Silverbolt is a vicious sadist who openly views himself as evil and revels in it, fights dirty, is down for basically anything, and creeps on Blackarachnia (and when Primal does like baseline Megatron in Beast Machines, Silverbolt voluntarily becomes a drone commander to get the brainwashed Blackarachnia for himself).
