After graduating, Caspar becomes an Imperial army general. Should Byleth support Edelgard instead of Rhea (leading to Crimson Flower), Caspar will join their cause, where he expresses relief that he made the right decision in doing so, believing that if he stayed in the monastery, he would have to fight his father, who intimidated him. Should Byleth support Rhea instead of Edelgard (leading to Silver Snow), Caspar will join their cause, saying that Edelgard is in the wrong by causing a war.

Should Caspar be recruited but defeated during the Academy Phase on Classic Mode, he will lose his life in another battle after the battle of Garreg Mach and thus be unable to make it to the promised reunion five years later.

If the Black Eagles route is chosen, in Imperial Year 1185, Caspar is assigned to the Black Eagle Strike Force at Garreg Mach. Like the other students, he is relieved to see Byleth return.

Following the capture of Derdriu and absorption of Alliance lands, Hubert states that Count Bergliez will oversee the newly-acquired lands, prompting Caspar to show surprise and state that Hubert intends to make his father quite busy.

If recruited into the Blue Lions house before the start of the war, Caspar will reunite with his Blue Lion comrades five years later in 1185. Although knowing that he has effectively abandoned his country, Caspar remains with his former classmates. Caspar mourns his uncle Randolph's death, wondering if Dimitri's methods are justified.

In Caspar and Mercedes' shared Paralogue, available in every route except Crimson Flower, intel arrives that a small battalion lead by the Death Knight have been scouting the monastery since it was reclaimed. Mercedes, believing the Death Knight to be her younger half-brother Emile, decides to confront him. Caspar follows her to protect her and a fight ensues, though the Death Knight refuses to attack anyone. In the aftermath of the fight, Caspar, Mercedes, and Byleth confront the Death Knight who passively affirms Mercedes suspicions. The two attempt to sway the other into leaving the war or joining the other's cause, but neither are willing. The Death Knight hands Mercedes the Hero's relic of House Bartels and leaves, warning that the next time they meet, he will kill her.

If not recruited into the Blue Lions or Golden Deer house, Caspar will be among the forces defending Fort Merceus alongside the Death Knight and Linhardt if the latter was also not recruited. He will meet his fate here unless the Death Knight is defeated before him.

A conversation with Dorothea after Chapter 20 of Verdant Wind reveals that, as the Empire was surrendering, Caspar's father, Count Bergliez, gave his own life so the soldiers fighting under him would be given quarter. His sacrifice moves Dorothea to tears.

If Byleth sides with Rhea, Caspar will join the Resistance Army, though worried by the fact that he would have to face his father in battle. Despite his worries, the Church of Seiros brings the fight to Enbarr, where Caspar learns that his father is leading reinforcements to protect the Imperial capital. Following the battle, Caspar learns that his father had died, sacrificing his own life so that his men could surrender, mourning his death.

Caspar (If defeated before the time-skip in Classic Mode)

Fell on a different battlefield after the battle of Garreg Mach. He was unable to make to promised meeting.

Caspar - Hotheaded General (Crimson Flower)

In recognition of his achievements during the war, Caspar was given the title of Minister of Military Affairs in the new Adrestian Empire. Though his command developed a reputation for occasional recklessness, he proved an able leader, guiding his troops to overcome countless obstacles. Long after his career had ended, tall tales of the glory and good cheer that he brought to his army endured.

Caspar - Roaming Instigator (Other routes)

After the war, Caspar set out alone on a journey of self-discovery. He traveled to every corner of Fódlan and even ventured abroad now and again. It is said that he got into mischief at every turn but that the victims of his antics, always more amused than harmed or offended, remembered him fondly and passed those stories on to future generations.

Caspar and Byleth (Crimson Flower)

Almost immediately after Byleth and Caspar had celebrated their marriage in style, the battle against those who slither in the dark began in earnest. As the new Minister of Military Affairs, Caspar worked with Byleth to command the Imperial army and bring peace to Fódlan. His impulsive bravery, tempered by his spouse's more level head, proved instrumental to victory in a great many battles. Their troops became known most of all for their ability to laugh in the face of danger.

Caspar and Byleth (Azure Moon)

After taking on the role of archbishop of the Church of Seiros, Byleth announced her marriage to Caspar. But Caspar, never one to sit still for long, set out on a journey of self-discovery. He traveled to every corner of Fódlan and occasionally even took the archbishop along. It is said that he got into mischief at every turn, and that the archbishop sometimes had to invoke her authority to calm things down, but that the victims of his antics always came away more amused than harmed or offended in the end. The stories of their travels were remembered fondly for generations.

Caspar and Byleth (Verdant Wind/Silver Snow)

After ascending to the throne as the first leader of the United Kingdom of Fódlan, Byleth announced her marriage to Caspar. But Caspar, never one to sit still for long, set out on a journey of self-discovery. He traveled to every corner of Fódlan and even took Byleth along on occasion. It is said that he got into mischief at every turn, and that his wife sometimes had to invoke her authority to defuse the situation, but that the victims of his antics always came away more amused than harmed or offended in the end. The stories of their travels were remembered fondly for generations.

Caspar and Edelgard

Edelgard, the new Adrestian emperor, appointed Caspar as her Minister of Military Affairs, and the two devoted themselves to ruling Fódlan. Caspar quickly developed a reputation for recklessness in his duty, but he compensated for it with successes in the field and was given leeway by the emperor as a result. Privately, the couple's relationship as husband and wife was more tempestuous. Their spats were frequent, but it is said that Edelgard took pleasure in her ability to influence Caspar, and Caspar enjoyed reining the emperor in from time to time. It was a strange but happy union.

Caspar and Linhardt

After the war, Linhardt and Caspar abandoned their noble houses to pursue a carefree journey wandering the world. They traveled to every corner of Fódlan, and even ventured abroad now and again. Caspar got into trouble at every turn on their travels, but Linhardt was always there, begrudgingly, to get him out of it. The records of their adventures were immortalized in a book by an anonymous author, entitled "The Thousand Roads and Seven Seas." It is said they did eventually settle down, after the events in those stories, but where they actually did is unknown.

Caspar and Bernadetta

After some uncertainty about the details, it was decided that Caspar would marry into Bernadetta's family, seeing as she had claim to House Varley. The two had a chaotic reign and a marriage to match. Each time Caspar caused some incident, Bernadetta would demand promises as recompense. Over time, there oaths accumulated to such a great number that it became necessary to compile them, and the resulting document came to be known as the "47 Articles of Bernie." Among these Articles was the provision that, when counting their large quantity of children, Caspar was not to accidentally count his wife among them.

Caspar and Dorothea (Crimson Flower)

In recognition of his achievements during the war, Caspar was given the title of Minister of Military Affairs in the new Adrestian Empire. Though his command developed a reputation for occasional recklessness, he proved an able leader, guiding his troops to overcome countless obstacles. In his personal life, he began to spend a great deal of time with Dorothea, who had returned to the Mittelfrank Opera Company after the war. When her efforts brought the opera house to the peak of its resurgence, it is said that Dorothea relinquished her position as songstress in order to retire with Caspar. They are rumored to have spent the rest of their lives together.

Caspar and Dorothea (Other routes)

After the war, Caspar set out alone on a journey of self-discovery. He traveled to every corner of Fódlan, and even ventured abroad now and again. Though his antics found him no end of exciting adventures, he was always drawn back to Dorothea, who had returned to the Mittelfrank Opera Company in Enbarr after the war. The two spent more and more time together over the years, and when Dorothea's efforts brought the opera house to the peak of its resurgence, she relinquished her position as songstress and disappeared from the stage. It is rumored that the pair spent the rest of their lives together.

Caspar and Petra

Petra returned to her homeland of Brigid, and inherited the throne from her grandfather. As ruler, she declared independence from Fodlan, and renegotiated Brigid's diplomatic ties to Fodlan and Dagda on more equal terms. At every step along the way, she was accompanied and supported by her husband, Caspar, who had left Fodlan begind to be with her. It is said that the people of Brigid were initially suspicious of the union, due to Caspar's relation to a nemesis of their homeland, but that his tireless efforts of Brigid's behalf endeared them to him over time. It certainly helped that he made the queen very happy.

Caspar and Ashe

After the war, Caspar and Ashe embarked on a carefree journey around the world. They traveled to every corner of Fódlan, and even ventured abroad now and again, with the sole purpose of punishing those who preyed upon the helpless. Though Caspar seemed to get into trouble at every turn, Ashe was always there to get him out of it, and Caspar's bravery and strength returned the favor more than once. Though opposites in many ways, they shared the same view of justice, and their abilities complemented one another nicely. The stories of their adventures lived on as exciting and amusing folktales.

Caspar and Annette (Crimson Flower)

In recognition of his achievements during the war, Caspar was given the title of Minister of Military Affairs in the new Adrestian Empire. Though he was well-known for his valor in battle, it was his wife, Annette who reined in his recklessness and who truly kept the army in order. The troops came to see Annette as a motherly figure, and under her guidance, the Imperial army thrived. In their private life as a couple, the roles were totally reversed, as Caspar had to be the one to step in and correct Annette's various calamities around the house.

Caspar and Annette (Other routes)

Annette returned to her hometown of Fhirdiad, where she took up a teaching position at the school of sorcery and mentored many great sages. Unfortunately, she remained prone to accidents, and one such event nearly took her life. Separated from her students in the mountains, she became totally lost–but just when it seemed she would never be found, she was rescued by none other that Caspar, who happened to be passing through on his travels around the world. After this lucky reunion, he escorted her to Firdiad, and during this his time there, the two fell in love. The couple's fateful tale inspired a generation of young, starry–eyed students.

Caspar and Hilda

Caspar and Hilda, under no pressure to inherit any noble titles, spent the early years of peace after the war traveling. They journeyed to every corner of Fódlan, and even ventured abroad now and again. Caspar's antics caused endless entertainment for Hilda, who loved to stand by and watch him fight or squirm his way out of trouble. Eventually, their free-spirited adventure was called to an end by Hilda's brother, Holst, who offered Caspar a position as a knight in service of House Goneril. Caspar accepted, and before long, he and Hilda were married. The couple raised many children, and were said to have a notoriously lively household.

Caspar and Catherine (Azure Moon / Silver Snow*)

When Rhea absconded her post as archbishop, Catherine resigned from the Knights of Seiros and followed in order to protect her. They were joined by Catherine's new husband, Caspar, who had the same goal, and together they retired to a life of seclusion in the Red Canyon. Caspar and Catherine spent the bulk of their days farming and hunting, but since neither was content to go a day without wielding a weapon, they sparred routinely. The sound of their swords ringing out, in time with Caspar's heated cries, was heard daily across the valley.

*Requires Byleth to have an A Support or higher with Rhea.

Caspar and Catherine (Verdant Wind/Silver Snow*)

Catherine resigned from the Knights of Seiros and traveled across Fódlan with Caspar. They dedicated themselves to defending the helpless wherever they went, and in time, the names Thunder Catherine and Inferno Caspar were known to all the world. Legends of their adventures became so popular and well-known that even catchphrases such as "Face the wrath of Thunderbrand!" and "Hey, that's not your sword!" were recounted in the stories that were passed down for generations.

*Requires Byleth to not achieve an A Support or higher with Rhea.

Caspar and Shamir

After the war, Caspar and Shamir used their clout as heroes to establish a mercenary company. They branded themselves as crusaders for justice, punishing those who preyed on the weak or exploited others for their own gain. None could compete against their combined martial skill, and they became famous all throughout Fódlan. Their travels took them to every part of the world, and while Caspar's antics occasionally got him into trouble, Shamir's steady presence and firm demeanor helped to resolve matters amicably. Their stories endured as amusing anecdotes, passed down through generations.