Gren Din, also known as Glenn Din, is a character from the anime Last Hope who serves as a member of the elite Team Pandora. His background includes a profound personal tragedy, as he carries the guilt of indirectly causing his family's death; he had convinced them to work at the Hyper Drive reactor, an incident for which he blames himself. This history contributes to a personality that is initially hostile and abrasive, particularly toward the protagonist Leon Lau, but this stems from a deep-seated sense of responsibility rather than genuine malice.

Despite his gruff exterior, Gren is characterized as a Jerk with a Heart of Gold, demonstrating that his harshness often masks a principled and courageous core. He is notably sensitive about his rank and insists on being called Captain, becoming annoyed when teammates refer to him with nicknames like Sarge or Boy. A recurring trait is his inability to hold his liquor, becoming thoroughly intoxicated after only a few drinks. His dedication to his home is evident in his habit of shouting "For Neo Xianglong!" as a battle cry before engaging the enemy.

Gren's primary motivation is his duty to protect Neo Xianglong and to contribute meaningfully to the fight against the B.R.A.I. threat. His role in the story is defined by his lack of special abilities; as a Team Normal, he is incompatible with the Hyper Drive system that empowers many of his comrades. This limitation does not diminish his resolve, as he continues to risk his life using conventional weapons, proving his bravery by taking on dangerous foes like a B.R.A.I. bee even without enhanced powers. His initial distrust of Leon transforms once he witnesses the young pilot's skill, leading him to request a transfer to Team Pandora to fight alongside him.

In terms of key relationships, Gren develops a dynamic of vitriolic best buds with the character Doug Horvat, and their interactions are marked by constant bickering and a lack of overt respect that nevertheless signifies a strong bond. He also tends to be the team's Butt-Monkey, frequently suffering injuries, being underestimated, or finding his efforts surpassed by his more gifted allies. Throughout the series, Gren's development is visible in his integration into Team Pandora, moving from an outsider with a chip on his shoulder to a valued, if often unheralded, member of the unit. His notable abilities lie not in superhuman powers but in his resilience, his marksmanship with conventional firearms, and his unwavering determination to stand and fight on a team of extraordinary individuals.