Jaylah

Jaylah was a female humanoid who lived on Altamid as a scavenger evading Krall in the year 2263 in the. For years, she lived in the starship USS Franklin on the planet Altamid. In 2263, Jaylah helped the crew of the USS Enterprise (alternate reality), after it was destroyed, to fight and defeat Krall, leaving Altamid in the process. 

Escaping from Krall
Years prior to her encounter with the USS Enterprise crew, Jaylah and her family, like many before them, were attacked by Krall and imprisoned on Altamid. Jaylah and her family quickly realized that people were routinely taken from Krall's holding cells and killed, so she and her family decided to try to escape. During the attempt, Jaylah and her father were confronted by Krall's subordinate Manas. Jaylah's father stayed behind to hold off Manas, buying Jaylah time to flee at the cost of his own life.

Jaylah discovered the derelict hulk of the USS Franklin and made her home in it. She hid it using holographic technology and set up multiple defensive traps in the surrounding area. Inside the vessel, she discovered a music player, from which she particularly liked music featuring "beats and shouting." She also learned how to speak English from the ship's records. In time, Jaylah became a formidable warrior, skilled in martial arts and in wielding a quarterstaff that doubled as a rifle.

Alliance with the Enterprise crew
Jaylah became a scavenger to obtain parts with which to repair the Franklin and leave Altamid. In 2263, she came across, who had recently escaped the Enterprise inside a torpedo, and saved him from a pair of rival scavengers. Realizing Scotty was an engineer, Jaylah agreed to help him find his crew if he helped her finish her repairs.

One of Jaylah's traps was subsequently tripped by Captain and Ensign. After Scotty assured Jaylah the newcomers were his friends, she set them free. Using a transporter aboard the Franklin, Jaylah and her new allies were then able to bring and  to them. The group formulated a plan to rescue the rest of the crew and stop Krall from launching an attack on Starbase Yorktown. Jaylah initially refused to participate, revealing her traumatic history with Krall, but Scott convinced her they had a chance if they worked together.

Jaylah showed the Enterprise team how to infiltrate Krall's base. Using her holographic technology, she and Kirk set up a distraction for Krall's forces while the remainder of the team freed the Enterprise crew. Jaylah took up a sniper position to support Kirk, but was soon attacked by Manas. The two fought furiously, neither gaining a permanent advantage. Finally, Jaylah threw both herself and Manas off a tall building; while Manas fell to his death, she was caught by Kirk in mid-air and transported safely to the Franklin.

Later, Jaylah and the Enterprise crew departed Altamid on the Franklin and raced towards Yorktown, finding Krall had nearly penetrated the base's defenses. The crew was able to, using Jaylah's music player, destroy most of Krall's drones by disrupting their communications. Krall and three other ships were able to enter the base, but were stopped by the Franklin before they could crash into the base's headquarters. Jaylah, along with Scotty, was able to figure out how Krall (now known to be Balthazar Edison) planned to unleash a particular weapon on the base, information Kirk used to stop and kill him.

An invite to join Starfleet
Jaylah joined the Enterprise crew in celebrating Kirk's thirtieth birthday with a party on Yorktown, where she consumed a large number of alcoholic beverages to no apparent effect. She was delighted to hear from Scott that, on his recommendation, she had been accepted into Starfleet Academy. However, she was annoyed to hear she would have to wear a uniform if she chose to attend the institution.