ジミー・A・アレスター

"Be careful. It doesn't take much to get someone killed."

An elderly gentleman who is Twilight’s second-in-command and runs their operations division. His nature is always calm and exceedingly polite. He and Helsing have apparently crossed paths before.

the official website

His true name is James Moriarty, a criminal mastermind and arch-rival of Sherlock Holmes, who has been going under a false identity throughout the story./