The AvantGame's name comes from avant (アヴァン?), meaning innovative or original, and Game which comes from Gamera's name. Avan
The AvantGame is made to closely resemble Toto, Gamera himself, (according to the movie makers)  having a flatter face and vertical tusks. It has a larger shell than other suits, and longer arms which bare spikes and extensions similar to the RegionGame suit. The AvantGame suit also departs from Gamera's typical color scheme, this time opting to be predominantly brown with a yellowish underbelly.