Typically some sort of sweet scent as a he has a major sweet tooth and does like baking!
A floral scent is also common as he likes gardening as a hobby : D depending on the AU there might be specific scents being used!
Magi Castor sometimes likes too import a perfume made in Reim for nostalgia, but he also has custom perfumes made from flowers he grows in his garden that were native too Parthevia as a treat for Sinbad !