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The name used is an alias, nickname or surname found in an official source, but the actual in-universe name of this person is unknown in this continuity.
Kenny's grandpa (ケニーの祖父 Kenī no sofu?) was the grandfather of Kenny and Kuchel Ackermann. He was one of the few living remnants of the Ackermann bloodline with knowledge about the reasons for the persecution of his clan.
He was a sickly and frail old man, with limp, gray, neck length hair. He had weary eyes, a pointed nose, and a mustache that formed into a beard. Due to his health, he wore loose fitting clothes and appeared unable to leave his bed.
He was shown to be a rather stern and emotionless individual in his later years.
On his deathbed, he was visited by his grandson Kenny, who had just finished killing meddling Military Police officers. Baffled at the state the Ackermann family was in, Kenny questioned his grandfather about what could have caused the royal government to hate them so much. The old man started off by clarifying that the royal government did not hate the Ackermanns, but feared them due to the King's inability to control them. When Kenny became confused, grandfather Ackermann flatly stated that the monarchy possessed a power that allowed them to control the population, which a few select bloodlines including the Ackermann family were immune to. The Ackermanns, along with the Oriental clan rebelled against the king's ideals, which is what led to their persecution.
Kenny also revealed that he had found his sister Kuchel working in a brothel. Grandfather Ackermann was disinterested to learn that she had been impregnated by one of her clients, and intended to keep the child.
- Kenny Ackermann - Kenny was his grandson and their relationship was complicated. Although he seemed to love Kenny, he seemed displeased with Kenny's killings of the Military Police. However, he also trusted Kenny as far as to revealing him the secrets of the persecution of the Ackermanns.
- Kuchel Ackermann - As his granddaughter, it is supposed that he loved her and worried about her. During his last meet with Kenny, the boy told him of Kuchel's situation, being afraid of that could hurt him. However, the latter did not have any reaction after hearing the news.