Messar Robin Bastar is a supporting character in To Your Eternity, introduced during the Renril arc. He is a thin man with dark skin, messy hair, and three piercings around his mouth. He carries several heavy metal parts concealed under his clothing, which he can assemble into a new type of firearm, indicating his skill as both an inventor and a combatant. Messar is an illegitimate prince of Renril and a half-sibling to Princess Alma. He serves as a Renril informant and is a former friend of Bonchien Nicoli la Tasty Peach Uralis. After reconnecting with Bon, Messar becomes one of the immortal comrades assembled to aid Fushi, forming part of a trio that includes Bon and another ally. His role in the story is that of a resourceful intelligence gatherer and a loyal member of Fushi's Immortal Army. As an informant, he provides critical information about the movements of the Nokkers and the political situation in Renril. His motivations stem from his ties to the kingdom and his desire to protect it alongside his newfound allies. Though initially cautious, he grows into a dependable fighter who contributes both tactical knowledge and a unique firearm expertise to the group. His development is tied to his acceptance within the team and his commitment to the broader conflict against the Nokkers.