Kiloton

Kiloton is a Decepticon from the Japanese Generation 2 portion of the Generation 1 continuity family.

Even a despotic bellicist like Megatron has need for companions to favor over Starscream and provoke him with. What he has no need for is them getting killed, especially not by creatures he didn't plan on killing first. So, when Kiloton by human hands, events took a turn for the worse.

Fiction

G-2 story pages and minicomics

During the days of the Cybertron Alliance, Kiloton had business on Earth. Though no Cybertronian had been hostile to humans since the ratification of the alliance, an army unit took up arms against and killed him. Megatron was, to say the least, not amused. G-2 Part 3

Transformers Legends comics

Waspinator told his own Megatron a recap of Megatron's life story, including the time he lost his friend. Legends Comic: Bonus Edition Vol. 13

Ask Vector Prime

Vector Prime revealed that Kiloton was descended from Quintesson models designed for high-level tactics and strategy and was one of Megatron's earliest recruits,

Notes

• Okay, so Megatron's dead friend is a funny story. He only exists as that one image at the top of the page. Nothing, absolutely nothing of the text surrounding the image makes mention of him or otherwise provides the image with context. Why was he on Earth? Why did he get attacked? Why did he get killed? Why does his death bother Megatron? Did his death influence Megatron's choice to reignite the war? If you want any definitive answers, you'll have to ask Hidetsugu Yoshioka (and hope he remembers).