Daz was a trainee of the 104th Training Corps who participated in the Battle of Trost District. He later joined the Yeagerists in the year 854.
Daz had a short crop of spiky light hair. He had noticeable wrinkles around his mouth, apparently from his perpetual anxiety. He wore the normal uniform of the 104th Training Corps.
Daz was constantly terrified and had an ever-present fear of something bad soon to happen regardless of circumstances. He admitted to being so afraid of the Titans that he was glad to see his comrades be eaten rather than himself, and repeatedly attempted to either desert his post or commit suicide rather than face them again. To his credit, however, Daz was at least selfless enough to return to active duty after realizing that refusing to defend Trost District would guarantee the deaths of his family at the Titans' hands.
Appearance: Daz had a short crop of spiky light hair. He had noticeable wrinkles around his mouth, apparently from his perpetual anxiety.
Personality: Daz was constantly terrified and had an ever-present fear of something bad soon to happen regardless of circumstances. He admitted to being so afraid of the Titans that he was glad to see his comrades be eaten rather than himself, and repeatedly attempted to either desert his post or commit suicide rather than face them again.
Daz in the story: During a training exercise designed to test trainees' endurance to harsh climates, Daz overexerts himself trying to improve his scores and loses consciousness, forcing Ymir and Krista Lenz to drag his body with them. Although Ymir repeatedly suggests leaving Daz, Krista refuses, and Ymir is eventually forced to abandon Krista in order to use her Titan form to return Daz to safety. When Krista finally returns to the cabins herself, Daz is seen resting in a bed inside while doctors inspect him.
How Daz echoes later: While on the flying boat with the other Alliance members, Connie laments killing Daz and Samuel, while thinking about them trying to save the island.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.