Kamen Rider Fang

This form can actually be achieved in the show with the Double Driver by placing the T2 Fang Memory in the left side of the Driver, and placing the T1 Fang Memory in the right side. Since both Fang Memories are silver types (only works properly on the right side of the driver because the right side of the driver is meant to hold silver memories so it activates it's sounds before the gold memories on the left side) once both Fangs are placed in the driver. Both "Fang" sounds will overlap with each other. So instead of the driver saying <memory name> then <memory name> like it normally would when 1 gold and 1 silver memory is placed in it's proper slot, instead it will shout out "FANG" because both Fang sounds activate at the same time. Sadly Kamen Rider Eternal killed off T1 Fang T.T