Marquis Raeven was actually a cold-hearted person before the birth of his son. His intelligent and careful nature makes him seem cold-hearted and is characterized as an opportunist by some, Marquis Raeven is a good father and a patriot in the Re-Estize Kingdom. He is a highly skilled noble and a master manipulator, being able to single-handedly keep the Kingdom united through his connections to both the Royalty and Nobility Factions.
Try going for a posh/ fancy sounding voice, but also sound humble when addressing those on equal or higher standing.