Eren's founding titan is a skeleton because it was the elongated spine that formed the basis of his form. While the bodies of most titans are covered by flesh, Eren's founding titan is quite unique.
Eren has the same bony structure, but because his head was severed at the neck, his freaky Titan spine grows uncontrollably before connecting his torso and noggin, coming to form almost Eren's entire Founding Titan.
When Eren was beheaded, he completely disconnected from the rest of his body. This means that upon transforming, Eren only consisted of his head and the source of the titans that extended from his neck.
The reason his Founding Titan is a skeleton is because when Gabi blew Erenś head off, the spine grew uncontrollably, and turned him into this big monster.
Eren's Founding Titan is so different from Ymir's because his head was cut off right before the transformation and that spine thing that grew out of his detached body was forced to grow without the actual body, thus forming the enormous spine that walks behind the Rumbling with only the head, and Eren's head in it.
Its because when gabi shot his head off and zeke touched it the spinal creature extended itself to transform eren thus causing his spine to elongate causing erens founding titan to be so long extending his spine longer and making him so loooooong.
Founding Titan is the first and the strongest Titan of all the nine. If the Founding Titan is someone from Royal Bloodline, then it will possess limitless power. Eren Yeager was not someone of royal blood that's why he asked for Zeke's help to use the Founding Titan to its fullest.
Titan shifting power is transmitted by the consumption of spinal fluid. The Titan failed to drink eren and thus never became one of the 9 Titans. Cucked over by plot. If he had crushed his spine, we'd see a giant old man attack Titan.
His "special ability" is, that he changes the Titan Shifter himself. He builds willpower. And this willpower strengthens the Attack Titan, which makes him so strong, which makes him so fearless, which makes him so unwilling to give up and which makes him strong enough to overthrow the ones who endanger Freedom.
However, if the Founding Titan is inherited by someone outside of the royal family, the power can still be used if the inheritor is in physical contact with a Titan with royal blood. This is demonstrated when Eren Yeager temporarily used the Founder's power after striking the hand of Dina Fritz's Pure Titan.
The second is when Eren convinced Ymir that she has a will of her own, freeing her from the royal family's control, and she lent her power to Eren instead of Zeke.
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.
1 Eren's Founding Titan
Eren's spooky skeletal Titan form was by far the biggest since it was over two hundred and twenty meters tall.
Eren's Founding Titan powers make him easily the most powerful Titan seen in the series so far. While he had manifested some of these powers in the series previously such as when he saved Mikasa at the end of Season 2 by using his ability to control Titans, he needed contact with the Royal Bloodline to do that.
Eren's Founding Titan is abnormal in appearance and massive compared to other titans seen throughout the series. A recent CGI image released by MAPPA shows how big Eren's new titan form is.
So, why can't Eren use these incredible powers? It's simple -- he is not of royal blood. In order to truly access the Founding Titan's abilities, the holder needs to be in physical contact with someone of royal blood. This is why Zeke Yeager is needed.
Eren Yeager's founding titan form is the biggest physically and also the most powerful. Yeager inherited the founding titan after his dad injected him with a serum. Upon activating the founding titan, he uses it to gain control of other titans and wage battle against them.
Eren possessed the power of three Titans. From his father, Eren inherited the Attack and Founding Titans. After eating Lara Tybur during the Raid on Liberio, he gained the War Hammer Titan as well.
Eren, who is by now an Intelligent Titan, unknowingly uses the power of the Coordinate against the Smiling Titan, which works thanks to Dina's royal blood, resulting in Dina being devoured by other Pure Titans. Eren and the rest of the Survey Corps witness this as they escape the Armored Titan.
Assuming you meant a formerly-male Titan eating a Female Titan Shifter … Then he would emerge from his Titan as a Female Titan Shifter of his own. His new Titan form would be a Female Titan, breasts and all, with only stuff like facial features and hair color changing. His human body would be unchanged.
As all the titans were originally a single being, so eating all the titans should give Eren the power of the complete titan.
As Armin tries to rescue Eren, the Bearded Titan closes its mouth, biting one of Eren's arms off in the process, and swallows Eren, much to Armin's hysterical horror.
Over a thousand years ago, Ymir Fritz became the first Titan and the Founding Titan by obtaining the Power of the Titans. When she died, her split soul created the Nine Titans who razed the Marley nation to the ground. In its place they created the Eldian Empire.
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.
3 Levi Cannot Kill Any Of The Founding Titans, Including Eren. There is a theory that no Ackerman, even though they are more than capable of doing so, will be able to kill any of the Nine Founding Titans, Eren included.