She is a Warrior candidate (戦士候補生 Senshi Kōho-sei?, also translated as "Warrior Cadet") that is likely to inherit the Armored Titan power.
Falco is the second inheritor of the Jaw Titan who was originally a candidate to inherit the Armored Titan, after his predecessor.
In chapter 138 of the manga, Gabi was turned into a Titan, along with other Eldians at Fort Salta. However, she is only either a normal or abnormal Titan, rather than an actual Titan shifter and will need to eat someone that has one of the Nine Titans' powers to turn back into a human.
Around the year 843, Pieck Finger was chosen to inherit the power of the Cart Titan.
So, we do know that the Warriors are candidates for Titan powers and Gabi Braun was the first in line to inherit that power, but since the Titans disappeared after Eren's death, Gabi never actually inherited Titan powers and she never became a Titan.
you can clearly see here that the bones grew out from his head this means that if Gabby didn't shoot him before he touched Zeke. it's most likely that his entire body would transform.
In Attack on Titan final season part 2 episode 3, Eren loses his head, in a very literal sense. After the first half of the episode, Eren's head is severed from his body, and during the second half, Zeke confirms after Eren wakes up in the World of the Paths that Gabi did indeed shoot his head off.
One of these special titans is the Female Titan, a slender athletic titan with feminine features. She is currently in the possession of Annie Leonhart, a Warrior from Marley who was sent to Paradis Island with fellow Warriors Reiner Braun, Bertholdt Hoover and Marcel Galliard to locate the Founding Titan.
Around the year 843, Annie Leonhart was chosen to inherit the power of the Female Titan.
Pieck's Cart Titan is arguably the weakest of the Nine, but it comes with several advantages. Unlike its eight brethren, the Cart Titan walks on all four legs, making it an excellent method of transport. Pieck often has large structures attached to her back, which carry both people and weapons.
Isayama has revealed that Gabi's design was partially based on a sketch he made of a female version of Eren. Gabi and Eren both had a similar personality; wanting to kill the enemies and avenge the ones they lost.
Gabi's training as a Warrior must have also been harsh, and she excels at it. Before the raid of Liberio, she is expected to inherit the Armored Titan from her cousin Reiner, something she sees as a privilege she's earned through hard work. Eren is a great fighter, but Gabi is better.
Then Falco begins to express his true feeling towards Gabi by telling her he is in love with her and the true reason why he became a warrior candidate so she wouldn't inherit the Armored Titan and live a long happy life so they can get married, Gabi is shown to be blushing but Falco mentions he's also saying this as he ...
The Armored Titan (鎧の巨人 Yoroi no Kyojin?) is one of the Nine Titans that possesses armored plates of skin across its body. It is currently in the possession of Reiner Braun, although Gabi Braun and Falco Grice are two candidates being considered to inherit the power from him.
Ymir was able to transform herself into the Jaw Titan (顎の巨人 Agito no Kyojin?), a 5-meter Titan. She gained this ability after she ate Marcel Galliard, a Warrior from Marley, in the year 845.
Ymir is weaker simply because she did not know how to use the full extent of her titan power and had no training to further develop her powers.
After her identity was revealed, which resulted in her defeat by Eren Jaeger and Mikasa Ackermann, she crystallized herself into a coma to protect herself and the secrets that she held from being unraveled. Until her escape four years later, Annie was retained by the Survey Corps [Chapter 34, Volume 8].
Despite being male though, the body of the body of the Titan they transform into will still be female.
After closer inspection, and as the Titan gradually comes closer, they both realize it is Dina, the exact same Titan that devoured Eren's mother five years prior. As Dina approaches Eren and Mikasa, Hannes arrives to stop her.
After the battle of Shiganshina District, he took the power of the Titans from Bertholdt Hoover and became the Colossal Titan.
After these seventeen centuries when Karl Fritz, the 145th king of the Fritz family, abandoned the conflicts of Eldia and relocated to Paradis Island, the Female Titan was taken by the nation of Marley during the Great Titan War. Around the year 843, Annie Leonhart was chosen to inherit the power of the Female Titan.
We know that a titan shifter contains enough spinal fluid to distribute their powers to at least 3 people (although this might vary person to person). So if Maria, Rose, and Sina each had 3 people evenly consume their spinal fluid, there would be nine shifters (each holding ~1/9 of Ymir's power).
Alas, frustration from her slightly grating personality blossomed into full-blown rage when Gabi shot and killed Sasha Braus - one of Attack on Titan's true fan-favorites - in cold, potato-flavored blood. Murdering Sasha instantly transformed Gabi into the biggest villain of Attack on Titan thus far.
Following Eren's death the power of the Titans is undone and all of the Eldians return to their human forms. Gabi reunites with her parents and Falco, but their reunion is cut short by the arrival of the Marleyans from Fort Salta, who demand that the Eldians all prove they can no longer turn into Titans.
The nine Titan powers were the Founding Titan, the Armored Titan, the Attack Titan, the Beast Titan, the Cart Titan, the Colossus Titan, the Female Titan, the Jaw Titan and the War Hammer Titan.