Haschwalth is a tall, handsome, young-looking man with a thin build and long blonde hair, which descends past his shoulders, and blonde eyelashes. As a child, Haschwalth wore a light-colored dress shirt and carried a bow and arrow for hunting. His hair was also much shorter, only reaching his chin. He carried a medium-sized double-edged sword in a black sheath at his hip.
While speaking in a much more casual manner to Yhwach than some, Haschwalth still retains a highly respectful tone. He acted on this and attacked a fellow Sternritter despite the disadvantages it posed in doing so on the battlefield.
As a child, Haschwalth was very calm and unflappable, even when dealing with an outgoing and pompous boy like Bazz-B. He lacked confidence in his own abilities, having agreed with Bazz-B's assessment of him as a loser, and felt uncomfortable around his uncle, who would beat him if he did not bring home at least one rabbit every day for food.
However, he formed a strong friendship with Bazz-B when the latter decided to take him under his wing. As a young boy, Bazz-B followed Haschwalth when the latter was hunting rabbits, one of which he shot with his Spirit Weapon after Haschwalth failed to do so himself. Bazz-B criticized Haschwalth's skill, and when asked who he was, told Haschwalth to introduce himself first while inadvertently revealing his own name, prompting Haschwalth to introduce himself in turn.
Noting Haschwalth's cunning in getting him to introduce himself first, Bazz-B explained that he has been following Haschwalth because he did not think the latter could hunt anything himself.
