If Eren ate Annie Leonhart in Attack on Titan, he would inherit the Female Titan's powers, including hardening, enhanced agility, and the ability to attract Pure Titans, along with her combat skills and potentially some of her memories, significantly altering his abilities and the plot, as he'd gain crucial intel and power but also lose a potential future ally. The story would shift as the number of Nine Titans decreases, affecting future battles, especially against Marley.
If a Titan shifter eats another Titan shifter, the two powers merge into one, decreasing the overall number of the Nine Titans.
If a man eats the Female Titan, he still gets its powers. The “Female Titan” isn't female because of the user's gender. It's just the form that Titan power takes. So a male shifter would still inherit the same abilities, no extra rules or differences.
Instead of killing him outright, the Female Titan -- Annie -- decides to lift his hood and confirm whether or not he was Eren, as that was her objective. Even after the encounter, the Female Titan decides to not kill Armin.
It's not made clear if Annie and Armin ever end up together or not. The idea that Armin inherited his feelings from Bertholdt is probably not true though.
Her exceptional skills with swords and unarmed combat earned her the 4th rank, but she is also noted to be a lone wolf who struggles to work with others. She possessed the ability to transform into a Titan known as the Female Titan.
It is then knocked unconscious and about to be eaten by the Attack Titan, but is saved by the arrival of Reiner and his partially formed Armored Titan.
Titans did not possess a complete, functioning digestive tract; they merely had a stomach-like cavity that eventually filled up with what they swallow. After consuming a certain amount, they regurgitated the contents of the cavity before they continued eating more humans.
Why did Annie try to kidnap Eren? Secondly since he was the attack Titan there was a high chance he also had the founding Titan in him. Excluding this the reason she kidnapped him was to bring him back to Marley to have a warrior from there eat eren.
We blame Annie for eliminating Levi's squad in the line of duty, and we glorify Floch even though he conspired for the same reason: to eliminate the same squad. In the end… the result is the same: they both participated in the killing of Levi's squad…
Eren's true love, widely considered by fans and supported by the creator, is Mikasa Ackerman, though their relationship is portrayed as tragic and complex, evolving from a sibling-like bond to deep, albeit complicated, romantic love that he struggles to acknowledge due to his grand, world-altering plans. He confesses his feelings in the end, but it's within a tragic context, acknowledging he couldn't bear seeing her with anyone else and seeing a future where they lived happily in an alternate reality.
I think what makes her didn't burst out crying is because she witnessed Eren killed people mercilessly too. She's still in shock. Not to mention that before she beheaded him. She was already crying from the last scene of memory in the path that Eren sent to her.
Because it is impossible for anyone to surpass the Founder, each person who gained the power of the Titans was fated with the "Curse of Ymir" (ユミルの呪い Yumiru no Noroi?), which limited their remaining lifespan to only 13 years after first acquiring it.
The Cart Titan is in no way a weak link, but it can be considered the weakest of the Nine. Held by Pieck Finger for the run of the show, the Cart isn't built for direct combat or known for its overpowering strength.
Titan Attraction
Annie Leonhart used this ability to gather Titans on Paradis Island to the Walls during the fall of Wall Maria. The downside of the attraction ability was that once the Titans following the Female arrived at its location, they would attack the Female Titan and eat its body.
The vast majority of Titans have a masculine body shape, although all of them lack reproductive organs (they have no need to reproduce since they are humans transformed through injection of Titan serum. The exact composition of Titan serum is unknown, but is said to be Titan spinal fluid.).
On Earth, those are gases, but the extremely cold temperature of Titan, around minus 290 degrees Fahrenheit (F, or minus 180 degrees Celcius), allows them to be liquid as well (and maybe even solid).
Eren offered her freedom and infinite choices, Ymir doesn't know what to do with this, so she cries.
Falco's recently revealed Jaw Titan form is unlike any seen before, as it possesses the ability to fly—something absent in Marcel, Ymir, or Porco's previous Jaw Titan forms. This new Jaw Titan form has left many fans puzzled, questioning why Falco's Titan is different.
Seeing a way to break through the crystal, Eren disables the Jaw Titan and jams the crystal into its mouth. Applying pressure to the Jaw Titan's jaws, Eren is able to crush Lara's crystal and kill her, consuming her remains in order to gain the War Hammer Titan's power.
Entire wings of the formation were annihilated by Annie, often in strangely cruel ways. In her quest to get Eren, Annie kills dozens of scouts, including Levi's own squad. Levi's grief at seeing his fallen comrades is evident.
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.