Prefect Charyb (チャリブ・ザ・ギゾイド Charibu za Gizoido?) is one of the two perfect Gizoids of the Nocturnus Tribe, the other being Scylla. Charyb is a blue Gizoid that is built much differently than the others; he is able to fight underwater and use water-based attacks. When Charyb is in the water, he is almost invincible (taking only one point of damage per hit despite the strength of an attack). When Sonic and Tails' group tried to fight him, the condition of his lair made him impossible to stop. When Knuckles' and Shade's group took out Scylla, they drained the water from Charyb's lair allowing them to defeat him. He is more serious than his partner Scylla.
One of the sections of the Twilight Cage is also named Charyb; it is called Sector Charybdis (Charyb for short). He is based on the water beast Charybdis in Greek mythology.
- Prefect Charyb and Prefect Scylla are named after the Greek monsters Charybdis and Scylla.