Guri Medley is a wild child in the most literal sense possible. His birth parents are unknown to him. He doesn't know where he originally came from or why. Guri was raised in the wild and has no memories of anything before that. It's unknown what incident led to him being lost in the forests as a child but it must have happened at an exceptionally young age, possibly when he was still an infant.
That's not to say Guri didn't have any parents growing up. He claimed to have been raised by a ruby colored carbuncle in the wild. Guri claims the carbuncle talks to him and is the one who trained him as a summoner.
Guri has been around society long enough as an adult now to know how to talk and behave properly. Usually. He still has some quirks or odd habits. The wild will never truly leave him as hinted by his dress. He doesn't understand nudity taboos and so his only concession against modesty is a coeurl skin loin cloth.
This comment has been deleted.