No, the Light Blaster is an optical modifier. You must provide your own speedlight and a Canon EF mount lens to project images.
Only if you use a Nikon-to-Canon lens adapter. This specific unit is natively designed for Canon EF and EF-S mount lenses.
It is compatible with standard 35mm mounted slides. You can use vintage slides, custom-printed transparencies, or the included creative patterns.
It is primarily designed for portable speedlights. Using it with high-power studio strobes may require a dedicated adapter and carries a risk of heat damage to the slides.