I find the best moments of Optimus Prime (Primal) are when he's acting as the Dad to the Autobots. Like in Enter the Nightbird, when he tells off Wheeljack and Ratchet for mocking the robot. "We're here to guard the robot. Not make jokes at its expense." Primal has his own moments, particularly with Cheetor, Garry Chalk told me that with the relationships, Rattrap was like the bratty kid who he had to bring into line, Cheetor was the son who he had to drill some responsibility into. One of my favorite moments was in Prime in Speed Metal where after Knock Out is stopped, Optimus looks at the other bots and says "Explanations can come later. From all of you." in this disapproving dad tone that lets you know that the Autobots are in trouble.
Traitor (to Cliffjumper, who was accusing Mirage of treachery): "We don't want bad feelings. Just the electrocells." "Try and remember which side you're on, Mirage." "Keep your mind on the Decepticons, Cliffjumper." The Core "What's the matter, Chip?" "I guess I was hoping Devastator might join the Autobots for good, but that's probably just a dumb old dream." "Hang on to your dreams, Chip. The future is built on dreams. Hang on." More than Meets the Eye, pt. 3, Optimus and Ironhide: "You gave us all a pretty good scare." "It's been worse. I remember the time on Cybertron—" "Save the war stories, hot shot. Just remember, there's a thin line between being a hero, and being a memory." "Am I 'drooling' correctly?" "The word is 'dribbling', Optimus!" "Watch out Spike! I'm driving for a layoff!" "It's called a layup, Prime! And watch out for Tracks!" The Master Builders Optimus: My audio receptors! What is that noise?! Hoist: Humans call it 'music'. Sparkplug: Not this human! Jazz: Sounds all right to me! "Blaster! Decrease volume! ... Blaster! SHUT UP!" Ironhide: Where did the call originate? Optimus: I don't know! All I can hear is that blasted Blaster! Blaster Blues "Perhaps someday, you'll see that there are more important things in life than revenge." "Possibility: Growing." The Secret of Omega Supreme
That time in Cybertron when Optimus literally pulls a dad joke and the Autobots cringe at him. *after Bud shows the Autobots how to swim* Optimus: "Thanks, Bud! Without you, we would've been... heh, sunk!" Scattorshot: "Ooh, that one hurt."
my dad is optimus. he turns in to the truck and is a man. when the darkest hour is come he is gonna give it to ya baby no what im sayin?