An 'intelligent' treeky, George was 'befriended' by Hisaka during one of his curious (yet incredibly naive) attempts in understanding human emotion. When Kagiri told him to 'hug a tree' instead of her, he took her words quite literally. He ended up embracing a treeky in the Logging Area which, to his own surprise, hugged him back. It even followed him back to Terminus, where it now resides in Silveren's mandragora garden.
George the Treeky apparently cannot speak, though it does display human-level intelligence. It can understand human speech and can even answer via writing. George possesses a laidback and sarcastic personality, bluntly stating its opinions on Hisaka's affairs. Despite its dry brand of honesty, it does genuinely care for the wizard's wellbeing.
Hisaka appears to be capable of understanding George telepathically, apparently understanding the treeky at an instinctual level, coupled by the observance of gestures. Silveren seems to share the same ability.