Dolph

Dolph was a highly trained Nether Gate assassin, he was known as Michafute during his days as an assassin, and was close to Lyon, who was then known as Mismar.
Dolph was the one who killed Rosalind Godwin, Marscal's wife. But the Godwins took him in after Nether Gate was forcibly disbanded. To repay him, Dolph became the personal Godwin assassin, taking various drugs and compounds to increase his effectiveness.
Unlike Childerich, Dolph keeps himself very clean and immaculately neat, and can be very polite. He was the one who gave Marina, Dark Arcanum to use on Belcoot. Dolph seems to have training equivalent to that of Sagiri, his voice does not inflect and his facial features do not change regardless of the situation he is in.