Messar Robin Bastar is a supporting character in the anime To Your Eternity, introduced during the third season. He is an illegitimate prince of Renril and works as a skilled informant for the kingdom. Messar is physically characterized by thin build, dark skin, and messy hair, with three piercings around his mouth. Under his clothing, he carries various heavy parts that can be assembled into a new type of firearm, reflecting his resourcefulness and preparation.

His personality blends a seemingly carefree, headstrong demeanor with a remarkably sharp strategic mind. Despite his casual appearance, he is highly competent and loyal to the cause of defending Renril. Messar is a former friend of Bonchien Nicoli la Tasty Peach Uralis and becomes a core member of what is referred to as the immortal trio or the Three Undying Warriors of Fushi’s Immortal Army. He is also a half-sibling to Princess Alma.

Motivated by his ties to Renril and his friendship with Bonchien, Messar plays a key role in the conflict against the Nokkers, the parasitic entities that threaten humanity. He repeatedly risks his life in battle and has returned from death on multiple occasions, underscoring his commitment to the fight and his resilience. His abilities center on his intelligence, combat experience, and the custom firearm he constructs, which gives him an edge in both information gathering and direct confrontation.

Throughout the story, Messar develops through his interactions with Fushi and the other immortals, evolving from a royal informant into a steadfast soldier willing to sacrifice himself for the greater good. His relationship with Bonchien is particularly notable, as they share a history of camaraderie and mutual respect. Messar’s growth reflects a deepening sense of duty and selflessness as he becomes an integral part of the immortal army’s efforts to protect the world.