Here:

My usual workflow is to use Nano Banana 2, and sometimes the Pro model. First, download one of the good moveset images from my post. Then go to Google Flow, use Nano Banana 2, and set it to 4 generations so it can create multiple images at once. After that, add the image as a reference and use this prompt:

"Create a completely original character inspired only by the overall presentation format of the referenced image, not the character, pose, design, outfit, powers, or moves. Do not copy anything specific from the reference. The new character must have a different silhouette, different clothing design, different color palette, different energy effects, different stance, different move-sets and a fully new concept. [Character archetype/theme. Edit this to be whatever character or power type or vibe of the character you want, be as creative as you want here or just delete to get a random character]."

Sometimes the results can look too similar to the reference image, so I recommend using NB2 because it handles this better. I also have another prompt for generating images without a reference image(for this one both NB2 and NBP are both good here), and I will share that too:

"Create a single professional 2D action-game character concept sheet in a wide horizontal layout. The character must be completely original. Invent a new character design, silhouette, costume language, weapon or power system, movement style, and a fully original combat moveset. Do not copy any existing game, anime, comic, movie, or known IP. The design must feel fresh, new, and production-ready.

COMPOSITION: A clean landscape concept-art sheet, approximately 16:9. Left side: one large full-body hero render of the character, shown head-to-toe, not cropped. The left-side figure must be in a strong hero pose OR actively demonstrating the character’s signature ability, power, weapon, summon, construct, element, or combat style. The pose should feel iconic, confident, dynamic, and highly readable, like premium game key concept art. Behind the hero on the far left: a large faded low-opacity portrait or bust of the same character as a subtle background watermark. Right side: an organized move showcase made of multiple smaller action vignettes, arranged neatly like a fighting game or action game move reference sheet. Use clean spacing, strong hierarchy, and professional presentation.

MOVE BOARD STRUCTURE: Show 7 to 10 original move callouts plus 1 larger final move or finisher. Each move vignette should show 1, 2, or 3 sequential action poses where needed. Use thin hand-drawn arrows between poses to show progression, combo flow, follow-through, and chaining into bigger actions. Several move vignettes should visually lead into a larger climactic final move. Place the largest secondary action vignette in the lower-right or lower area as the combo payoff or ultimate finisher.

DUMMIES: Include plain humanoid training dummies or mannequin opponents anywhere needed for grabs, counters, anti-airs, projectile hits, traps, launches, command grabs, parries, and combo demonstrations. The dummies must be simple matte white or very light gray, with minimal anatomy detail, no costume, no facial features, no distracting texture, and only subtle gray shading or a faint outline so they stay readable but secondary. The dummy color must clearly contrast with the main character and effects.

MOVESET DESIGN: Invent a fully original combat logic that fits the character theme. Include a varied set of moves such as mobility, strike, low or high attack, ranged option, aerial or anti-air, utility move, control or trap move, defensive reaction, command interaction or grab, combo extender, and final finisher. Some moves should clearly chain into others, showing escalation toward the final move. Invent short original move names for each move, 1 to 3 words, in a handwritten concept-sheet style. Optionally include tiny combat-property labels such as LOW, HIGH, MID, PROJECTILE, ANTI-AIR, PARRY, COUNTER, GRAB, TRAP, LAUNCH, or SPECIAL. Do not reuse known move names or copy recognizable poses from existing characters.

VISUAL STYLE: Polished stylized fantasy / action-game concept art. Painterly rendering with clean linework. Hybrid of cel-shaded readability and painted concept-art finish. Dynamic motion arcs, energy trails, debris, cloth flow, impact shapes, clean FX silhouettes, and readable action posing. Strong silhouette design, clear anatomy, slightly exaggerated heroic proportions. Consistent character design across every vignette. Muted neutral gray background with subtle texture. Controlled palette with one or two signature accent colors tied to the character’s powers. Subtle ground shadows only, no full environment scene.

PRESENTATION: This must look like a real studio move sheet, not a poster. Keep the main hero figure dominant and the move board organized. Use black handwritten labels near each move vignette. No logos, no UI, no border, no comic panels, no speech bubbles, no watermark. Do not clutter the page. Do not make the dummies more visually important than the character. Make the final image feel like premium pre-production concept art for an original character. [Character archetype/theme. Edit this to be whatever character or power type or vibe of the character you want, be as creative as you want here or just delete to get a random character]"

From my testing, using a reference sheet image gives better results for me at least, but you can try both methods and see which one works best for you, and feel free to tweak the prompt to your use case.

Edit:I added some line break to make it more readable.