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You should feed it whatever food boosts the stat you personally find to be the most lacking or the stat you want to raise the most. While each genus has a favorite food as far as familiarity there is no set "best food" for each familiar since it is based on what stat you personally want to raise.
PSN ID: sled_dogs76 60" Pioneer Kuro Elite PRO151FD, Yamaha RX-V3900 A/V Receiver, Oppo DV983-H player. Coming soon: 2 Seaton Submersives from Mark Seaton