"Sentinel was once one of the impulsive-types until a disastrous "unsanctioned" mission he'd suggested with best friends Optimus Prime and Elita-1 ended in the loss of Elita. Though both 'bots carried the grief, Sentinel blamed Optimus for abandoning her. When Optimus officially took the fall for the mission and Sentinel failed to speak up for his part of it, he placed his anger on his former friend and drove himself to climb the Autobot ranks into the Cybertron Elite Guard through strict adherence to military protocol."

In season 1 he only has a small appearance in only a few epsioded. If you get the part I hope you are able to stay with the project for the addtional seasons as he gets more screentime.

For his voice, the team has had two suggestions. One is that he could sound like the senator guy from this monty python clip (https://www.youtube.com/watch?v=HrcbCW4y9Dw).