Attack on Titan: Crimson Bow and Arrow

 Eren is Shingeki no Kyojin's protagonist. His adoptive sister, Mikasa, notes on numerous occasions that he acts on impulse without thinking things through, and she often pulls/carries/throws him when he starts fighting with others to protect him from himself. Along with Mikasa, he tends to spend his free time with their mutual friend, Armin.  His father is a doctor (whom is well respected by Hannes and potentially many more) whilst his mother is a housewife. When Eren was a child, he saved Mikasa from being sold off when a visit to her home with his father. Three men—killers of her parents—were in her house, and he killed two of them—one by slitting his throat and the other by charging at with a quickly assembled spear. Mikasa herself killed the third man after Eren urged her to fight whilst the man strangled Eren. After this, he gave Mikasa his scarf and Eren's father adopted Mikasa into their family. Later, when the Colossal Titan broke through Wall Maria the debris from this attack scattered and hurtled towards his home. He could only watch on as his mother—trapped under the rubble of their house—was eaten by a titan. This event lit the fire of revenge within Eren that he would kill every giant and not live a life cowering in fear.  Sometime after this—before the time skip that jumped a few years ahead, to when he became a soldier—his father injected him with something. It's unknown what at this time but it turns out, because of the injection, Eren can utilize the ability to transform into a titan himself (which explains how his limbs were able to regenerate) with side effects of a high fever and massive stamina drain.  Eren has a special titan power called the "Co-ordinates", by which he can direct abnormal titans to attack elsewhere. Note: Eren Yeager is the official English translation by Kodansha.

Eren Yeager

Age: 15 Birthdate: February 10 Height: 170 cm (5'7") Weight: 68 kg (150 lbs) Position: 104th Trainees Squad, Scouting Legion Graduation rank: 1st  Mikasa is Eren's adoptive sister and mutual childhood friend of Armin. Mikasa shares an unbreakable bond with Eren following events in their past, and rushes to protect him whenever he is in danger. Mikasa possesses impressive fighting skill and strength even as a child.  As a teen, Mikasa is considered a genius among all the army trainees and is incredibly skilled at combat and agility. She constantly worries for Eren's well-being and lives to protect him.  When Mikasa was younger, her parents were murdered and she was taken hostage to be sold into slavery. Eren managed to find her and killed two of the three kidnappers by catching them off guard, despite only being a child. The third kidnapper discovered the scene and began strangling Eren while holding him in the air. Mikasa, trembling, grabbed Eren's knife from the floor. In that split second, Mikasa came to terms with the cruelty of the world, gaining perfect control of her own body and using that strength to kill the kidnapper in a single strike through the heart—killing him to save Eren.  In the aftermath of this trauma, Mikasa asked Dr. Jeager where she could possibly go from here. She was cold and had no place left to call home. Eren gave Mikasa his red scarf and Dr. Jeager welcomed her into their family. Because of Eren's heroics and this gesture, she feels she owes her life to the Jeagers. She continues to wear Eren's scarf from that day into adulthood, and they are inseparable.

Mikasa Ackerman

Age: 15 Birthday: November 3 Height: 163 cm (5'4") Weight: 55 kg (121 lbs) Position: 104th Trainees Squad, Scouting Legion Graduation Rank: Outside the top 10  Eren's best friend, he is physically weak yet emotionally strong. Even though lacking in actual combat, Armin is a genius on theoretical courses and can make plans even under extreme pressure. Even so, Armin kept on thinking that he is weak. He himself does not notice the things he does for Eren and Mikasa, and believes himself to be completely incompetent and hates himself for having to rely of Eren and Mikasa.  (Source: Wikipedia)  Note: Armin Arlert is the official English translation by Kodansha.  

Armin Arlert

Age: 16 Birthday: June 16 Height: 178 cm (5'9") Weight: 70 kg (154 lbs) Affiliations: 104th Trainees Squad, Scouting Legion Graduation Rank: 7th  Marco Bott is a member of the 104th Trainees Squad, and graduated as the 7th ranked trainee in his class. He was assigned to fight the Titans after the breach of Wall Rose, and given command of his own squad.   Personality Marco is an idealistic person, valuing the good of the group above his own interests as well as understanding and coping with his own shortcomings and limitations. The others respected him greatly, and considered him to be a natural leader suited to his dreams of joining the Military Police. Unlike those who join the Military Police for safety and privileges, his reasons of joining it were genuinely faithful. He was shown to be an excellent judge of others, recognizing Jean's potential as a leader and encouraging him to believe in himself. He was also shown to have a talent for preserving order among the other trainees, whether resolving arguments or keeping them calm during battle.  Story Marco is first introduced during the initiation of new recruits, and is intimidated by their instructor after expressing his desire to join the Military Police. He later attempts to maintain order when the recruits question Eren about the attack on Wall Maria, hiding the others when their questions become too upsetting. During his time as a trainee, he befriends Jean Kirschtein and the two were often seen together. He seems to have been one of the only people to recognize Jean's potential, encouraging him to embrace his natural abilities as a leader.  After the Colossal Titan attacked Trost, Marco was assigned command of the 19th Trainee Squad and ordered to support the vanguard forces. He was eventually among the trainees stranded when the retreat order was given, without enough gas to scale the Wall and escape Trost. When Mikasa and Jean rally the others into charging headquarters, which had become surrounded by Titans, Marco is quick to join them. Inside the station, he became vital in Armin's plan to reclaim the overun supply room and leads the main group. Armed with rifles, the recruits acted as bait and lure the seven Titans occupying the room into position. Marco managed to maintain order in the group, keeping everyone calm until they could fire and blind the attacking Titans.  He is later seen among the regrouped forces, attempting to keep order when people like Dazz give into their fear. Marco did his best to comfort them and keep morale high, even when they were ordered to return to Trost. He joined the other recruits up on the Wall, acting as bait to distract the Titans from the main operation involving Eren Yeager. Later, he was among the recruits that head into the city to battle the Titans. There, he helped to rescue Jean when his gear malfunctioned and would eventually join the others in battling the Titans while Eren sealed the hole in Wall Rose.   He dies during the battle for Trost. His death serves to illustrate the grim reality of life for the soldiers, as even the most talented can meet an ignoble end while facing the Titans.  Note: Marco Bott is the official English translation by Kodansha.

Marco Bott

Ian (ã‚¤ã‚¢ãƒ³) is a member of the Stationary Guard in Trost District.  Ian first appears in Ch. 5 after Trost District is breached by the Colossal Titan. He compliments Mikasa for killing a Titan that was attacking a group of evacuating civilians.   In Ch. 12, a plan is formed for Eren to use his Titan powers to seal the breach with a boulder. Ian is placed in charge of the elite squad assigned to protect Eren on his mission.   When Eren loses control of his Titan form in Ch. 13, Mitabi and Rico advise Ian to abort the mission and retreat. However, Ian orders his soldiers to continue to defend Eren down to the last man, as Eren is their only hope against the Titans.   In Ch. 14, Eren regains his senses due to Armin's intervention, and Ian orders his soldiers to protect him until he reaches the breach even at the cost of their own lives. Ian uses himself as bait to lure Titans away from Eren, sacrificing his life in order to ensure the success of the mission. First Appearance Anime: Ep. 5  (Source: Shingeki no Kyojin Wikia)

Ian Dietrich

Father of Eren and foster father of Mikasa. He is a renowned doctor who was well respected in the District of Shiganshina after he saved the village from a mysterious viral epidemic by developing vaccines. He also provides a medical house call service to the people of Shiganshina and to various towns in addition to having a network of contacts within the Corps of the Shiganshina district.  In the basement of the Yeager family house he hides a secret which he refers to as the "truth" and upon meeting Eren after the fall of the Wall Maria in the year 845, injects him with a series of chemicals and amnesiacs and entrusts him with the key to the "truth", before disappearing. (Source: Wikipedia)  Note: Grisha Yeager is the official English translation by Kodansha.

Grisha Yeager

Birthday: August 1 Height: 185 cm (6'1") Weight: 95 kg (210 lbs) Affiliations: 104th Trainees Squad, Scouting Legion Graduation Rank: 2nd  Strong willed, with a solid constitution. Most adept at gaining the trust of his comrades. Ranked no 2 of the trainee class. Helps Eren out during his training days.  Major Spoiler It is later revealed that Reiner is a Titan-Shifter. He is the Armored Titan that opened the gates of Wall Maria along with his partner Bertolt, the Colossal Titan, with the intention of slaughtering the wall's inhabitants. Note: Reiner Braun is the official English translation by Kodansha.

Reiner Braun

Pastor Nick is a member of a religion that worships the Walls as holy.  He claims that he lost his family as a result of addiction to Vine.   As a religious leader, Pastor Nick used his influence to oppose any modification of the walls, be it permanently sealing the gates or even mounting cannons on the top. Though he claimed it was blasphemy for humans to "maim" the wall, the real reason was to reduce the risk of workers discovering the Titans within during renovations. (Source: Shingeki no Kyojin Wikia)  Note: Minister Nick is the official English translation by Kodansha.

Nick

Keith Shardis was the head instructor of 104th Trainees Squad. He seemed to be a friend or have some sort of relationship with Dr. Grisha, as he knew Eren is the son of the doctor and praised Eren for his effort.  He is a former Commander of the Survey Corps, and was in command when Wall Maria fell in 845. First Appearance Manga: Ch. 15 "One By One" Anime: Ep. 1 "To You Two Thousand Years Later"  (Source: Shingeki no Kyojin Wikia)

Keith Shardis

One of the graduates from the 104th Training Corps. He was a part of the 34th squad sent to support the rear vanguard during the invasion of Trost. He was killed after the squad was ambushed by a group of Titans.  First Appearance Anime: Ep. 5  (Source: Wikipedia)

Attack on Titan: Crimson Bow and Arrow Characters