This painstaking frame-by-frame stop-motion King of Fighters animation was designed by Storm Collectibles:
Using articulated 1/12 scale action figures, it features the Ikari team (Ralf & Clark, Leona) versus heroes Kyo, Benimaru and Daimon, shot on a tabletop setup and finished with digital effects.
Classic stop-motion techniques involve a fixed camera (or locked-off phone/DSLR), set to capture one photo per frame.
Incremental pose changes create the motion—while supports/rigs (wires, stands, or clips) hold figures in dynamic airborne or impact poses; these are visible in some raw-looking frames and are typically painted out or masked later.
Controlled lighting (softboxes/lamps visible in the wider shots) keeps exposure consistent across hundreds of frames.
A 42-second clip like this requires hundreds to over a thousand individual photographs. Animators often use onion-skinning software (Dragonframe or free equivalents) to reference the previous frame while posing the next. Joint limitations of the figures are worked around by careful articulation, sometimes swapping parts or using replacement pieces for extreme poses.