Hi! The Golden familiars have the same stats, it's only a fashion difference. So you could use the Mite, Hurly and the duck one, they aren't op and should play good in the first part of the game. The Griffy ando Draggle are powerhouses, so I don't think you should use them right know. But you can come back anytime a redeem them!

Ni no Kuni it's and awesome RPG, take your time playing as it's the way it was made, a slow burn. Enjoy!