What separates a flat cartoon from one that looks sculpted is not detail, it is light. Give a character one clear light source, a rounded core shadow and a shadow on the ground beneath it, and a simple shape suddenly reads as a solid object sitting in space. Everything else is styling.
That is the thread running through the 31 characters below. Some are rendered like vinyl toys with glossy highlights, others are inked flat and given depth by a single cast shadow, and a few use nothing but a soft airbrushed gradient. The subjects range from baby dragons and astronaut bears to samurai cats and art deco villains, so there is a wide spread of shape language to borrow from.
If you are still building confidence with proportion and expression, it is worth working through some simpler character drawing ideas first, then coming back here to add dimension. Character work also pairs well with practising expressive eyes, since on a stylised face the eyes carry almost all the personality.
Each idea below names the medium and the one technique that makes the dimensional effect work, so you can pick a character and start rather than scrolling for inspiration. For more ways to push depth on paper, these 3D digital art ideas are a useful companion.
1. Chubby Baby Dragon with Watercolor Splashes

A round teal dragon with oversized amber eyes and pink wings, sitting in a burst of magenta and turquoise splashes. The body is rendered with a soft gradient from lit top to shadowed belly, which is what makes it read as solid. Keep the highlight in a single spot on the forehead and let everything curve away from it.
2. Chibi Knight in Shining Armor

A tiny knight in polished gray armor holds a sword in one hand and a single red flower in the other. Armor is the easiest way to practice dimensional rendering because each plate is a simple curved surface. Give every plate one highlight strip and one dark edge, and add a hard cast shadow to plant him on the ground.
3. Detective Fox in a Trench Coat

A fox in a deerstalker and belted trench coat peers through a magnifying glass, drawn entirely in graphite. Fabric folds are the challenge here. Draw the coat as a series of soft cylinders, put the darkest tone where the fabric turns away from you, and leave the shoulders bright.
4. Astronaut Teddy Bear on Color Blocks

A teddy bear in a white spacesuit stands against flat blocks of orange, navy and mint. The suit is white, so all the form has to come from the grays. Use three values only, keep the helmet glass as a simple curved reflection, and let the flat background push the figure forward.
5. White Chalk Witch on Kraft Paper

A long-nosed witch stirs a bubbling cauldron, drawn purely in white chalk on brown kraft. Working in reverse teaches you to think in light rather than line. Let the paper stay as every mid and dark tone, and reserve the brightest chalk for the steam and the cauldron rim.
6. Watercolor Mermaid with Flowing Hair

A wide-eyed mermaid with sweeping blue hair and a scaled teal tail, painted with wet splashes bleeding out behind her. Paint the figure tightly and let the background run freely; the contrast between the two is what gives the piece depth.
7. Ink Line Robot Chef

A boxy robot in a chef's hat, drawn in clean ink line with light hatching along one side. With a hard-surfaced character you can build the whole form from straight-sided boxes and cylinders. Hatch only the right-hand side of every form and keep the left completely white.
8. Sumi-e Samurai Cat

A cat in samurai armor stands ready with a sword, painted in loose black brush strokes with ink splatter behind. Load the brush once for the robes and let the stroke break dry at the hem; that dryness reads as fabric weight better than any shading would.
9. Dinosaur Scientist in a Lab Coat

A grinning green dinosaur in a lab coat and round glasses holds a bubbling flask, drawn as clean outlines ready to color. Keep the linework a single weight, round every corner, and let the props do the character work.
10. Pop Art Superhero Panda

A panda in a red cape and blue suit holds a golden shield, framed by radiating speed lines and halftone dots. Ink the outline heavily first, lay the halftone behind, and rule the speed lines from a point directly behind the figure.
11. Watercolor Professor Owl

An owl in a mortarboard clutches a book, painted in soft browns and creams over a loose green wash. The rounded body is built from a single graded wash, dark at the base and pale at the chest. Add the feather texture only once the base is fully dry.
12. Fiery Phoenix Chick Hatching

A red and gold chick bursts from a cracked egg in a ring of flame. Flames read best when you paint them from the outside in, laying the deepest red first and dropping yellow into the wet center so the two blend on the paper.
13. Graphite Zombie Chef

A gangly zombie in a chef's hat stirs a steaming pot, drawn in graphite on gray paper. Exaggerated proportion carries the whole character; stretch the limbs well past life and keep the head small so the silhouette reads instantly.
14. Pirate Crab with a Treasure Chest

A red crab in a tricorn hat and eyepatch scuttles beside a small treasure chest. Give the shell one broad highlight across the top and darken the underside sharply, which is all it takes to make a flat oval look domed.
15. Astronaut Bunny Floating in Space

A rabbit in a spacesuit drifts among hand-drawn stars and blue swirls. The suit is white against white paper, so every edge has to be defined by a gray shadow rather than an outline. Keep the visor solid dark as the one anchor point.
16. Art Nouveau Forest Fairy

A fairy with translucent wings stands inside an ornate arched border of vines and stained glass. Design the frame first as a symmetrical shape, then fit the figure inside it, and keep the wings pale so the border can carry the color.
17. Bookish Cat in a Cardigan

An orange cat in glasses and a knitted cardigan carries an armful of books, with a soft shadow behind. The clothing is what makes it read as a character rather than an animal. Draw the cardigan as a cylinder around the torso and let the cuffs bunch at the wrists.
18. Neon Graffiti Hacker Raccoon

A raccoon in a hoodie hunches over a glowing laptop, painted in electric purple and cyan with drips running down. All the light comes from the screen, so keep the underside of the face bright and everything above it in shadow.
19. Clay Style Elephant Painter

A gray elephant in a beret and red overalls stands beside a tiny easel, rendered with the soft matte finish of modelling clay. Avoid sharp highlights entirely; clay scatters light, so use broad soft gradients and a slightly darker rim on every edge.
20. Baby Griffin Oil Portrait

A fluffy young griffin stands in a dark oil-painting setting with warm rim lighting along its back. Placing a cartoon character in a classical lighting setup is an easy way to make it feel substantial. Keep the background almost black and let one warm light define the whole silhouette.
21. Ink Nine Tailed Fox Spirit

A fox spirit in long robes stands surrounded by nine flowing tails and curling flame, drawn in fine black line with no shading. Let the tails overlap each other in a clear front-to-back order, since that overlap is the only depth cue you have.
22. Zen Panda with a Bonsai Tree

A panda in saffron robes holds a bonsai on a tray, painted in soft ink wash with a pale mountain behind. Keep the palette to two colors plus gray, and let large areas of the paper stay completely empty.
23. Snowboarding Yeti

A grinning yeti in a beanie and goggles carves through a spray of snow. A white character on white paper needs its form built entirely from blue shadow. Use one cool blue for every shadow and keep the lit fur as untouched paper.
24. Art Deco Vampire Cat

A black cat in a high-collared crimson cloak stands before a gold art deco sunburst. Symmetry and metallic accents do the work. Rule the background geometry first, keep the figure a flat silhouette, and add gold only along the edges.
25. Aztec Sun God Character

A round-faced sun deity with a flaming headdress stands inside a stepped geometric border in red, teal and gold. Build the border from one repeating motif, keep the figure symmetrical, and let the rays radiate evenly from the center of the face.
26. Gnome Architect with Blueprints

A bearded gnome in a hard hat unrolls a blueprint next to a treehouse, drawn in clean pencil outline. Props tell the story here, so give him a tool belt, a rolled plan and a magnifier and let the pose stay simple.
27. Glowing Chalk Moon Rabbit

A rabbit pounds a mortar under a crescent moon, drawn in white chalk on black paper with a scattering of stars. Build the glow by layering chalk more heavily at the center and feathering it outward with a finger.
28. Underwater Sea Turtle Explorer

A wide-eyed turtle with a coral-encrusted shell glides through a sunlit reef. Underwater scenes need atmospheric perspective: keep the background pale and low in contrast, and reserve saturated color for the turtle itself.
29. Ninja Bunny with Throwing Stars

A rabbit in black and red ninja gear leaps mid-air with shuriken spinning around it. The pose does all the work. Draw a strong curved action line first and hang every limb off it, then add a small ink shadow below to fix the jump height.
30. Baby Elephant at a Pottery Wheel

A small elephant in an apron shapes a terracotta pot, drawn in warm grays and browns. Keep the ears large and the limbs short, which is the standard proportion trick for making any animal read as a baby.
31. Gargoyle Photographer in the Rain

A stone gargoyle with a camera and backpack stands under a glowing street lamp in the rain. Wet surfaces reflect light in vertical streaks, so run the lamp's reflection straight down the cobbles and keep everything else desaturated.
