Board Thread:Theories/@comment-17499145-20170509021147/@comment-30473998-20170809052229

Note to everybody from May and June -- a lot more information has been revealed. [but we still don't know a lot right now]

The 9th titan is the "War Hammer Titan", which is currently in posession of the Tybur family. As of 8-9/17, they have done nothing yet and have only been mentioned once.

After the war against Eldia, Marley took 7 titans -- the Colossal, the Armored, the Female, the Jaw, the Cart, the Beast, and the War Hammer. Judging by what the wiki itself has written, I'll just assume this:

'''During the Eldian War a member of the Tybur family was injected with the Titan Serum to eat Eldians (but there is a flaw... why do so? They supported Marley first... or maybe this person was special). This Titan happened to eat the human form of the War Hammer Titan, and gained the War Hammer Titan. After this war the Marleyan Government decided to sort things out. Six people were given and entrusted with the CAFJAB (the titans above) Titans, while under the supervision of the Marleyan Government. Because the member of the Tybur family was from a family who opposed King Fritz first and helped Marley, they were allowed to keep the titan (and taking it would be an offense to Eldians?).'''

The Attack Titan was taken by somebody in secret who managed to somehow hide their identity from the Marleyan Government (or went from Paradis to Marley?) and eventually was handed down to Eren Krueger, who spied on the Marleyan Government. All this time the Tybur family is not doing anything with their Titan (that we know).

As of today, the owner of the 9th Titan is called "Tybur", but this is only a temporary name. I expect Isayama to release more information about the Tybur family due to the amount of possibilities and theories arising from it.