My pick for Gareth Bryne is David Boreanaz:
David Boreanaz (/ˌbɔːriˈɑːnəz/;[1] born May 16, 1969) is an American actor, television producer, and director, known for playing the roles of vampire-turned-private investigator Angel on Buffy the Vampire Slayer (1997–2003) and its spinoff Angel (1999–2004); FBI Special Agent Seeley Booth on the television crime procedural comedy-drama series Bones (2005–2017); and Jason Hayes in the military drama series SEAL Team.
Bayle Domon is an intelligent man who acts gruff, but seems to have a heart of gold. Though it states that he is a broad, muscular man with a round face, his appearance to a degree is less integral than the character, IMO.
He makes me think of a snugly teddy bear who could kill if need be.
At the moment my heart is quite set on Jeffrey Dean Morgan:
Jeffrey Dean Morgan (born April 22, 1966) is an American actor. He is known for his roles as John Winchester on the fantasy horror series Supernatural (2005–07, 2019), Denny Duquette on the medical drama series Grey's Anatomy (2006–09), The Comedian in the superhero film Watchmen (2009), Jason Crouse on the political drama series The Good Wife (2015–16), Negan on the horror drama series The Walking Dead (2016–present), and Harvey Russell in Rampage (2018).