Dino Brachio stands as second-in-command of the Dino Knights, loyally supporting and advising leader Dino Tyranno. He is acknowledged as the group's oldest, largest, and wisest member, consistently seeking peaceful resolutions to conflicts with the Dragozaurs. Yet, when diplomacy falters, he readily enters combat wielding the Axe of Valor. His deep loyalty and protectiveness drive him to shield fellow Dino Knights and defended humans, often placing himself in peril for their safety.

Transformed from a prehistoric Brachiosaurus by Earth itself 65 million years ago, he joined the Dino Knights to combat the life-force-draining Dragozaurs. After their initial victory, he entered prolonged slumber, reawakening in the modern era when the Dragozaurs resurged to threaten Earth once more.

Despite his massive Brachiosaurus form, he displays surprising agility and swift movement in battle. He utilizes a powerful tail whip and a massive energy-blaster cannon mounted on his back. His combat effectiveness is amplified by transforming his entire body into a weapon and integrating specialized Dino Weapon allies; Dino Kenty transforms into a drill attachment and Dino Pachy becomes a sword, significantly augmenting his offensive power.

Personality analysis suggests a potential ESFJ type, marked by warmth, responsibility, and a strong focus on relationships and duty. He adheres strictly to the Dino Knight code and structure. An alternative Enneagram Type 8w9 analysis highlights assertiveness, independence, a desire for justice, and protectiveness, which can sometimes surface as stubbornness or a domineering approach.

He commands respect and serves as a mentor, particularly to younger members like Dino Sabre. His profound connection to Earth's history and guardian role is underscored by titles such as "Power of the Ancients" used during his activation sequence. His character role and core traits remain consistent across the main series and the original OVA media.