Ok. Thanks for your advice. I am making the following character changes:

Brakedown- Kup (G1)
Bulkhead- Springer (G1)
Excellion- Hot Rod (G1)
reformatted into
Rodimus (Energon)- Rodimus Prime (G1)
Hot Shot (Armada)- Bumblebee (G1)
Ultra Magnus (Energon)- Ultra Magnus (G1)
Megatron is the same but gets reformatted into
Galvatron (Energon)- Galvatron (G1)

Also for the Junkions I am going to use the Scrapmetals from Cybertron,
and one will be orange (instead of yellow, red, blue) which will be Wreck-Gar