Stalker

The Stalker is a naturalist, far more interested in observing the habits and habitats of his fellow denizens of Cybertron than becoming involved in their war. Equipped with a jet pack and active camouflage system, he is surely far too well-equipped to run into any trouble.

Transformers: Rise of the Dark Spark
The Stalker was journeying through the ruins of Crystal City, taking notes about the insectoid protoforms found there, as well as their interactions with alloygators and scraplets. His observations were disrupted by the arrival of the Decepticons Shockwave, Soundwave and Starscream, and he eagerly changed his focus to these new specimens. He watched as the Decepticons conquered the Insecticons' leaders, and then switched his attention once more, this time to the Autobots Ironhide and Sideswipe as they made their escape with the Dark Spark. He watched the Autobots' battle in the train station, but ultimately his recorder was noticed by Bumblebee and his recordings abruptly ceased.