Consider Bumblebee
RiD's not my favourite thing, but one thing that I did really, really like about it was how they tried to develop the character of Bumblebee. At the end of TF Prime Bumblebee regained his voice and had a sudden personality change into being a more mature character
(kinda dumb for a Cosmic MacGuffin to change a character's personality, but G1 did the same thing with Hot Rod/Rodimus Prime
). In Prime's absence Bumblebee took command and in TF RiD we see Bumblebee step up again as Autobot leader. Even when Prime returned he didn't usurp Bumblebee and resume his role as leader. This was important and I'm glad that they didn't just return Optimus Prime to the status quo. I quite liked how RiD was not an "Optimus vs Megatron" show.