It's so hard to NOT pick one of the scions but it's Y'shtola! G'raha and surprisingly Urianger are also Godric's close friends, too :) But I like to think that Godric's and Y'shtola's relationship became more intimate during endwalker. His biggest enemy would be Noah Gabranth since he and Godric are both from Landis so his hatred for him is a bit personal. I wonder if we'll see more of him later on in the patches or next expansions...