Charity: Marcas owns and operates a non-profit known as the Horizon Group that raises funds through various works to then donate to worthy charities. They're always looking for new donators, sponsors, and projects to fund.
Sin-Eater: Marcas almost died once. Most medical professionals would say he /did/ die, but something held death at bay and Marcas has been a Sin-Eater ever since.
Parties: Most wouldn't necessarily suspect it, but Marcas is actually a big party-er. He holds them and crashes them regularly.
Piano: Before he was running non-profits, Marcas was a classically trained pianist and going to Durham University in England for music.
British: Marcas comes from across the Pond where he grew up just outside of London with his younger sister Isobel.