Fui Fui was a Turtle/Humanoid Saucer Beasts that briefly saw action on the opening of Ep. 7 of the UFO Robot Grendizer Anime and battle against Capt. Golman's Saucer Beast, Jin Jin.

Fui Fui was part of the Earth advance force, and was much like Game Game, in were the Saucer form was the main body, with just head an extremities. It was pink, light green and purple in color, and its head resemble a turtle, with a blade for a Mohawk on the head, and blades on his arms and legs for close combat, with an even larger one that hang in the back (the top of the Saucer Mode) which it could use as a sword or throw it. It had martial art like combat skills as well could fire a laser beam from the Mouth. Like many saucer beasts, Fui would eject blades from the side for spin attacks in its Saucer mode.

As Blacki's Motherburn ship headed towards Earth, an unknown Space Saucer is detected trailing him – he launches a contingency of Minifo Fighters but these are quickly taken out by the intruder. Blacki then sends out his Saucer Beast, Fui Fui, to attack. The Intruder vessel transforms into a Saucer Beast itself (Jin Jin) and the two proceed to fight, though the battle between them was brief, and Fui Fui was dispatched by Jin Jin. Before Blacki could retaliate, the commander of the Beast calls him out and recognizes that the Mystery beast has the insignia of the Vega Royal Guard, Blacki stands down and allow it to land in the Motherburn hangar.