Schrödinger

He, as the Millennium Group courier, also was present at the H.M.S. Eagle's deck, indicating the Huntress Rip Van Winkle how proud Millennium was of her and how well she had served, all the while as Alucard proceeded to gruesomely kill her by impaling her upon her own musket. He flitted through the battle with his teleportational powers and was also seen, chastising Millennium lieutenant Zorin Blitz for disobeying HQ's orders to stand ground until reinforcements were ready to storm Hellsing HQ, within her own mind/illusory world. He witnessed the devastation of London perched upon the spires of St. Paul's Cathedral.

He later decapitated himself with a SS knife, allowing his blood to seep in the torrents of blood Alucard was draining, thus becoming the poison the Major envisioned. As he existed everywhere and nowhere as long as he could recognize himself, he was utter and completely lost within the millions of souls stored within Alucard; thus he existed neither anywhere nor nowhere, nor did Alucard himself, as he had absorbed the soul of Schrodinger. This causes Alucard to vanish slowly, leaving only the Hellsing pentagram inscribed upon blood the place where he left. Thirty years later, however, Alucard managed to return by destroying all souls within him except for Schrodinger's-returning and acquiring his full abilities in a single stroke.