Board Thread:Manga/@comment-29012123-20170511142229/@comment-40053827-20190706184659

I'd say that the Attack Titan, beside of his strenght, endurance, regen. abilities, also changes the Titan Shifter and the way he acts.

My Theory is, that the longer you hold the Power of the Attack Titan, you become more and more a person who wants to fight the system that endangers the Freedom which the Attack Titan strifes for. Eren changes drastically from a boy who wanted to become a soldier and kill all the Titans to someone who leaves friends and family behind to fight for the bigger picture. For these people it might look like he betrays them, they feel hurt by his words and actions. But the Freedom seeking Attack Titan dosen't care about small things like friends, family or hurt people. The holder of the Attack Titan becomes someone who wants to crush the oppressing system and leads the "Attack".

He is somewhat the "leader" or more the "Spearhead" who leads the other Titan Shifters to fight for Freedom. If they disobey, he also fights them merciless and, if needed, eats them to use their Powers to accomplish his "Freedom". That's probably also the reason, why he can fight every other Titan Shifter without real special abilities, and still manage to defeat all of them if needed. The Attack Titans endurance doens't just affect his unwillingness to surrender in a fight, but also the holders unwillingness to surrender to the oppressing system and enemy of the Freedom he strifes for.

He first fought for the Freedom of the Walls against the Titans, and as soon as he found out about the rest of the world, he strifes for the Freedom of the whole world, which would explain his drastic change of character.

The Attack Titan probably also needs a strong willed person to be used to it's fullest potential. That would explain why Grisha, someone who knew about the oppressing system of the Marlyans, didn't do much to fight it. Grisha wasn't a strong willed Person. He was part of that underground organization, but lost all his will after he got captured and didn't want to inherit the Attack Titan from Eren Kruger and take up Krugers Mission. But even he changed somewhat to someone, who really, besides all his fears, wanted to change something. He was passionate and dedicated to his goals. He caught the Founding Titan and gave his Powers to Eren. He also left all of his knowledge in his basement and wanted to tell Eren all his secrets.

Eren on the other hand is full of energy and willpower. You could say, that Eren is probably the perfect example of someone who should inherit the Attack Titan.

So my Theory is, that the Attack Titan dosen't really have any special Abilites like armor, size, full body hardening, long Arms, etc. 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.