This is Garnak hug Rodimus Prime.
I can tell which one of them you were talking about when you said 'who is this' so I'm going to show you the information that I found on Google.
Garnak is a minor fictional character, a Collective Brute from the 2005 IDW Publishing Generation 1 continuity family in the Transformers universe. He is depicted as a friendly, simple-minded alien who possesses regenerative healing abilities.
Species and Traits: A bulky alien "Brute" capable of severe self-repair, including regrowing lost eyes.IDW Comic Debut: First appeared in the "Chaos" story arc (starting around 2011), initially stranded on planet LV-118 alongside his companion Codder and an ego-driven scientist they called the "Admiral".Allied with Rodimus: Helped the Autobot Rodimus escape the Admiral, later joining the crew to travel back to Cybertron and Earth.
Rodimus Prime is the evolved form of the Autobot Hot Rod, who becomes the leader of the Autobots after being chosen by the Matrix of Leadership, succeeding Optimus Prime in The Transformers: The Movie (1986). While initially a brash and hot-headed youth, as Rodimus Prime, he gains maturity, power, and wisdom but struggles with self-doubt and the immense responsibility of leadership, often reverting to his Hot Rod persona when overwhelmed. He is a major character in the Generation 1 continuity, known for leading the Autobots against Galvatron and Unicron.
Origin: He starts as the energetic and impulsive Autobot, Hot Rod, who is chosen by the Matrix of Leadership to become the new Prime.
Leadership: He is a capable but conflicted leader, often feeling inadequate compared to Optimus Prime and second-guessing his decisions, though he ultimately proves his courage.
Transformation: The transformation from Hot Rod to Rodimus Prime involves a significant increase in power and a more mature, armored appearance, often with a trailer that houses a combat deck.
Conflict: A major part of his story arc in the animated series is his struggle with leadership, leading to moments where he reverts to Hot Rod, only to be called back to his Prime duties.
Legacy: He is a beloved but sometimes controversial figure, with some fans disliking him for his perceived role in Optimus Prime's death, while others appreciate his journey of overcoming self-doubt.