So Kamen Rider Gaimu’s first full frontal image has hit. It clarifies two things: Gaimu really does appear to be fruit-themed and the “Lock Seed” looks something like a pad-lock. This particular Lock Seed, for his Orange form, has two orange-colored circles on it. The shoulder armor has hinges, which makes it seem as if they can open. There is a section of armor on his back which looks like it also has a hinge.

Thanks to DecaEnd on HJU for the above images.

Is this a second form or Second Rider? Regardless he is banana-y.

Thanks @TokuMaru on HJU for this image.

So a new detail has emerged! The DX Sengoku Driver in a not quite completely painted version has appeared online!

Putting the scraps of images together it appears that the Seed Lock starts off as a padlock with the fruit half protruding from it. Gaimu takes this this Seed Lock and places it into more or less the center of the Driver which has a hole that allows for it to lock on and into position. While the Seed Lock is put into place the “Knife Cut” is in the up position shown in the image of Gaimu holding the Orange Lock Seed. After the Seed Lock is in position the Knife Cut can be pivoted into the down position which opens up or cuts in half the fruit, exposing the seed inside. The above image clearly shows the orange has a hinge at it bottom and the image of Gaimu holding the Lock Seed shows the unlocked padlock in his hand with the seed exposed and the cleaved half hanging open held by a hinge.

Thanks @TokuMaru on HJU for this image.