Bud Hansen, the youngest brother of Tim and Coby Hansen, is 11 years old at the series start and later turns 12. He embodies youthful exuberance and naivety, fueled by a vivid imagination steeped in science fiction television, ninja movies, and the Galactic Guardians. His immediate aspiration to be a movie director reflects a dramatic flair, evident when theatrically quoting films during play, like pretending to be a ninja with the Mini-Con Reverb. Despite age-driven impulsiveness, Bud displays surprising maturity and wisdom in critical moments, calming disputes or offering fair perspectives. This duality sometimes leads him into danger, such as an unprotected orbital reentry, as the Autobots lack full understanding of human development. Bud aids the Autobots' quest for the Cyber Planet Keys and Omega Lock from their arrival on Earth, alongside brother Coby and friend Lori Jiménez. He helps rescue and repair the Autobot Landmine and selects the Autobot base site. His unique ability to hear the Omega Frequency, an inaudible signal from the Omega Lock, proves vital. Bud contributes practical ideas, persuading Scattorshot to implement a catapult system and assisting with stealth coating for the base. He forms a close partnership with the Mini-Con Jolt, who transitions from calling him "Master Bud" to "Bud-dude." They collaborate on research, using Jolt's internet connection to uncover leads on the Omega Lock, directing the team to a museum in Mexico. Bud devises holographic disguises for Transformer refugees by being scanned in various costumes. Bud's adventurous spirit leads to hazardous situations. An unauthorized trip through the Autobot space bridge causes panic, followed by danger when a missile strike sends him and Scattorshot plummeting toward Earth; Coby and Jolt intervene. Bud narrowly avoids legal trouble using Mini-Con holograms to deceive authorities and hides Mini-Cons from his parents. His quick thinking identifies geological tremors revealing an imminent reservoir collapse threatening Rockville. Family dynamics shape Bud's experiences. Father Robert Hansen encourages his creativity and leadership, teaching him to think outside the box. During Starscream's invasion, the family enters military protective custody. After being kidnapped by Starscream to Gigantion, Bud's involvement with Autobots is revealed. Though initially skeptical, his parents become convinced of the Transformers' existence and allow him to join the Gigantion mission, recognizing the children's unique adaptability. Following the black hole crisis resolution, Bud returns safely to Earth. Years later, he attends Coby's wedding to Lori, maintaining his imaginative spirit while evolving into a more responsible individual who balances playfulness with earnest problem-solving.