Adelheid Bernstein/Story

Past
Adelheid is the son of Rugal Bernstein, the notorious crime boss. At some point in his life, Adelheid and his sister Rose Bernstein reside on an airship called "Sky Noah".

The King of Fighters 2003
During the climax of the 2003 tournament, Adelheid challenged the Ikari Team, the winners of the 2003 tournament, at the behest of his sister. Upon his defeat, Rose threatened to kill the Ikari Team, but Adelheid refused, showing his compassion in a fight.

The King of Fighters XI
His story in The King of Fighters XI implies that he faced the Ikari Warriors Team and was defeated by them. He peacefully chats with Heidern and explains that he is only following his father's legacy. In his ending for the game, he seems to appear regretful for his actions and berates his sister for insulting his opponents.

The King of Fighters XIII
Under the control of Botan, Rose host The King of Fighters XIII tournament and is still under her sway to host the XIII tournament. However, her actions causes Adelheid to worry, causing him to team up with Heidern to investigate this mystery, and tries to help the forces of good suppress the evil plans of Those from the Past. When Rose is finally freed, he reassures his sister he would punish those responsible for her subjugation.

The King of Fighters XV
Nothing is currently known about the whereabouts of the two Bernstein heirs, however, their father is confirmed to have been revived.