Dina Fritz was the first wife of Grisha Jaeger, a member of the Restorationists, and, before having her son Zeke, the last descendant of the royal family living in Marley. She was caught for treason against Marley and was turned into the Abnormal Titan that would later eat her husband's second wife, Carla Jaeger.
Appearance: Dina was a small woman; petite in her frame and relatively short. Her eyes were large and light in color as was her fair skin. Dina's blonde hair passes her cheekbones but does not reach her shoulders and is kept parted down the middle.
History: In the year 824, Dina first appears as a person sent to the Restorationists by "the Owl," an unknown mole in the Marley government working for them. She introduced herself as a member of the royal family. It is explained that a branch of the royal family refused to flee to Paradis Island with King Fritz at the end of the Great Titan War and Dina was the only remaining member of that group.
Story: Around 13 years later, in the year 845, when the Warriors invade the Walls and the Colossal Titan breaches Shiganshina District in Wall Maria afterwards, many Titans proceed inside and among them is Dina. Shortly after Bertholdt Hoover kicked in a hole in the southern gate as the Colossal Titan, Dina approached him as he exited his Titan form. Strangely however, rather than try to consume him, she ignored him and went into Shiganshina.
Trivia: Dina is the only known Pure Titan shown to kill a victim before devouring them. Dina is the only Pure Titan to be killed by Pure Titans. Dina, as a Pure Titan, is the first Titan to kill a character on-screen.
Source: Dina Fritz (Anime), available under CC BY-SA 3.0.