Charles possesses a strict personality, but displays a weakness towards innocent females and astute females. During life, he possessed a dream of a "possible future" that vanished with his death, but that future manifests with him in his current form. He wishes to use the Holy Grail for the "the advent of a world of steam civilization", but also feels that the modern world itself is not too bad after acquiring knowledge of it upon being summoned. He can be described as a "reliable ally" depending on the nature of his Master.