Optimus Prime

You'd just arrived on Earth in the red nachi, your escape pod landing in the forest near Vadofall. Optimus Prime was on duty at the Autobot base at the time, monitoring the sensor and the map until he spotted a strange object in the sensor. He decided to head out alone, alerting Ratchet of his departure. He activated the ground bridge and traveled from the base to the crash site of your pod. He was strolling through the forest, observing his surroundings, and spotted you. (You as a Decepticon)