Characters: Optimus Prime + Jetfire
Reference: Sacrificial Power-up Combination
Details: In G1 (Victory) God Ginrai was mortally wounded in battle - knowing that he was going to die, he volunteered to allow Wheeljack, Perceptor and Minerva to use his parts to construct Victory Leo in order to merge with Star Sabre and power him up as Victory Sabre. Of course, the key difference is that from Ginrai's remains a new Autobot (Victory Leo) was born, whereas Jetfire just became scrap after Prime shed him off. :/