Charlie

Charlie is a goblin living in the Yggdrasil tree, on a small island south of the Grand Knight waypoint shrine in the Orobas Fjords. You must kill him to acquire Yggdrasil's seeds.

You can mindread him to gain a Malachite Gem and some random loot (note: this only works if you are currently on the quest Reaping the Seeds). His treasure box is in his tree house. Be warned though, if you have opened the chest before defeating Charlie then there won't be anything in his treasure box.