Marlon is a non-giftable character who lives in the Adventurer’s Guild with Gil, just east of Pelican Town. You will meet Marlon the first time you enter The Mines, he will give you a sword and tell you to explore them. Once you complete the introductory quest, you will be allowed to enter the Adventurer’s Guild, which is open between 2:00PM-10:00PM. Inside, Marlon will buy all the items you looted from The Mines. You will also receive a Slime Egg from Marlon when you build your Slime Hutch.