I found the stencils, but some of the Lagann parts might be too small?
Lagann:
Core drill:
For the core drill, the best color would be a fluorescent green. (if not possible, then plain silver like the autobot logo will do)
Lagann might be best as red. Ideally the eyes and the circle on the forehead would be fluorescent green too, but that isn't possible as you only do single color stickers right?
Sticker size would be about the same height as the autobot logo on your stickerboard