| The subject of this article has no official name.|
It is a fan-given name as substitute for lack thereof, and should not be considered as part of the Attack on Titan universe.
As a human he had light, shaggy hair, light eyes and a large mouth. His face had visible wrinkles indicating a later age.
The Bigmouth Titan was 7 meters tall, had a large head for its body size, a big mouth, and short brown hair.
Long before his existence as a Titan, the Bigmouth Titan was an Eldian man living in the nation of Marley. As a part of the Eldia Restorationists, this man witnessed Grisha Yeager's acceptance into their group. This man was also present when news from the Owl arrived that Marley was planning to invade Paradis Island to wipe out the Eldians living within the Walls, and was very distressed at the news. When Zeke Yeager, Grisha's son, exposed the plans of the Restorationists to the Marleyan authorities, he was captured and sent to Paradis Island. On the island, this man was injected with a Titan serum and was transformed into a Pure Titan.
StoryJumping Titan eats Thomas Wagner, an enraged Eren Yeager rushes forward with his vertical maneuvering equipment in order to slay it, but is intercepted by the Bigmouth Titan that bites off his leg, causing him to fall down. The Titan is then attacked by Mina Carolina, Nac Tias, and Mylius Zeramuski. During this, its arm hooks Mina's maneuvering wire, causing her to crash into a wall. The Titan then goes on to eat Mylius and Nac.
- The Bigmouth Titan is the second Titan seen to jump and the second Titan seen killing its victims before eating them.