The Beast Titan is an extremely unusual specimen, having a distinct, ape-like appearance. Its body structure and facial features are like that of a human's and it walks upright like one as well. It stands at a previously unseen 17 meters in height. Dark fur covers the large majority of its body, with the exception of its face, hands, feet, and torso. Its arms are also elongated, with long fingers and fully-functional thumbs. The proportions of Its upper body are similar to those of the Colossal Titan, possessing a massive chest and small head, as well as disproportionately long arms.
The Beast Titan is very intelligent and curious. It tried to communicate with Miche Zacharius in order to get information about the omni-directional mobility gear and learn about Miche's language. It has the traits of a leader, giving orders and telling other Titans what to do. While it was talking with Miche, it told the Titan that was eating him to wait instead of devouring him. If its orders are not followed, it does not hesitate on using brute force, seen when it crushed the head of the Titan that was eating Miche when it disobeyed him. The Beast Titan also appears very careless of the serious nature of its action, strolling away while Miche screams his last dying breathe as he is ripped apart on his order.
When Titans mysteriously appear within Wall Rose the Beast Titan is among them and is encountered by Miche Zacharius, who instantly notes the strangeness of its characteristics, mistaking the Titan with a regular Abnormal. As Miche's horse races back to him the Beast Titan unexpectedly grabs it. After noticing Miche the Beast Titan launches it at him preventing his escape and throwing him from the roof he was on. After Miche falls to the mouth of a Titan, the Beast Titan orders the other Titans to withhold on eating him so that it can question Miche about the omni-directional mobility gear. However, a Titan disobeys the Beast and it crushes its head to release Miche. The Beast Titan then proceeds to interrogate Miche, but as he neglects to respond out of shock, it theorizes that they do in fact speak the same language, but Miche is simply too frightened. After stealing the equipment, it allows the surrounding Titans to devour Miche. Miche screams in horror and pain while the Beast Titan is amused to see that he could in fact talk. It then leaves the grounds contemplating the ODM gear.
The Beast Titan is later seen again wandering around outside Utgard Castle where several members of the Scout Regiment are trapped by Titans, despite Titans usually being inactive at night. It then climbs up Wall Rose and watches the Titans surrounding the tower from a distance. After the scouts kill most of the larger Titans, the Beast Titan begins throwing large stones at the tower, killing Lynne and Henning along with their remaining horses. Shortly afterwards, twice as many Titans begin to advance while the Beast Titan roars at them from atop Wall Rose. Nanaba notices the unusually strategic method in their attacks, indicating that the Beast Titan is controlling the other Titans actions. As the Titans swarm Utgard, the Beast Titan descends the other side of Wall Rose.
Some of the Beast Titan's observed abilities are:
- Speech and Titan Control: It is able to fluently speak without issue in its Titan form, casually talking to other Titans and giving them orders which they follow loosely.
- Regeneration: Just like all Titans, the Beast Titan has the ability to regenerate any wound on its body at a tremendous speed.
- Precision: The Beast Titan's throwing ability is second to none, seen when it accurately threw a horse at Miche and again when it lands a direct hit when tossing a boulder at Lynne and Henning from a great distance away atop Wall Rose. It also seems to possess dexterous hands, as it managed to retrieve Miche's vertical maneuvering equipment without damaging him or the gear.
- The Beast Titan appearance resembles several cryptids, such as "Bigfoot", the Yeti, and Yowie.
- It appears to have had limited to no contact with the humans inside the Walls for a long time, as it expresses interest in humanity's omni-directional mobility gear.
- It makes an appearance in Attack on Titan: The Last Wings of Mankind.