Mountain Echo

Mountain Echo: The giant-type Makamou with the features of a parrot & an ape that has long hair which covers much of its face, able to mimic the sounds in the mountain side. It was destroyed by Echo Demon's Flame Barrage form.

Another Mountain Echo appeared, pursued by Slashing Demon. The Mountain Echo attempted to avenge its parents, only to be wounded by the Berserk Prince & killed soon after.

Prince & Princess
They were raising a Mountain Echo, resembled monkeys & were prone to maniacal laughter while using the fog to cover their abductions, knocking out the victims & using their voices to feed it. While Prince was destroyed by Echo Demon's Demon Fire Claw, Princess fell to Echo Demon's Demon Fire, though their child was able to fend for itself by then.

Another pair were later among the victims devoured by the Berserk Prince.