Jubstacheit von Einzbern
Also known as Acht. Current head of the Einzbern family, he has maintained the position for nearly 200 years now thanks to life-extending alchemical magic. The original creation of the Holy Grail War ritual was before his time, but he has been head of the family since shortly before the Second Grail War. Despite his advanced age and elderly appearance, he maintains the holdings of the Einzbern family just as capably as when he first ascended to the position of family head.