Cliffjumper

The only autobot who didn't die in only ONE show where a character died (Transformers Cyberverse)
I think that it's basically against the Hasbro rules to NOT kill him.
He was the only autobot that died in Transformers Prime (I at least think he was, i didn't watch all of it)

Transformers fan: "Let Cliffjumper live please"
Hasbro: Hahahahahah, NO.