Giantkiller

Aaron Henry Sterling is a 25 year old metahuman who was a classmate to Mavus Shaw and Junon Gareth before the Automaton invasion.

He was initially ranked a Tier 6 metahuman under the MTS, and possessed superhuman strength in his arms and legs.

Sterling joined the government metahuman justice corps under the initial codename Superarms and acted as a part time rescue operative. His primary job was to lift and destroy heavy barricades for first responders. Sterling worked under government official Reagan Giants, an extremely powerful Tier 3 metahuman who's cells acted as a conduit to the Power Force, which supplied him with incredible energy which he used for offence and defence.

During the events of the Automaton invasion, Sterling was given government clearance due to being a part time employee. However, as the Automatons began to decimate everything, the government soon found themselves overwhelmed by the alien machines. Giants was converted into a cybernetic slave, and with the help of his coworkers, Sterling managed to defeat his superior, dealing a fatal blow to the head.

Reagan's body began to release as much energy from the Power Force as possible, causing the energy to enter Aaron, converting his cells into conduits to the Power Force. This significantly amplified Aaron's super strength. Due to his inherent evo being largely muscle based, Aaron was able to draw out even more power than Reagan ever did, thus turning him into a Tier 0 metahuman.

Aaron worked alongside the survivors of the Automaton invasion to fight back the Automatons. The people gave him the new codename Giantkiller, due to being the one to land the killing blow on a converted Reagan Giants. In one fateful fight against the Automaton Core, Aaron summoned as much power from the Power Force as possible and unleashed a powerful punch that broke the fabric of spacetime, sending him hurtling through the wormhole into another dimension.