Step 1: Sonic the Hedgehog.
First draw a semi-circle for the head. You can also draw a semi-oval shape to make the head even cuter. Details shown on picture.
Step 2: Spikes
Draw the spikes of his hair into the shape you've drawn. Try to make them cute and curved down like this. Don't do it as 3 regular spikes, it will make him look 'un'chibi.
Step 3: Cute Little Ears.
Then simply draw 2 cute little ears for more chibiness.
Step 4: Face.
Then draw the eyes like chibi style so it will become even cuter.
Step 5: Body.
Draw the body into a shape close to a curved rectangle as the picture shows.
Step 6: Hands
Draw 2 cute little hands on the tummy area. One hand facing down and one hand facing up.
Step 7: Tummy
Draw an oval shape between the hands like this.
Step 8: Back Hair.
Draw 2 spikes on his back and a tail.
Step 9: Even Cuter.
To make it more chibi-like add wings to the back of him.
Now you finished sonic!
Step 10: Pikachu
First draw an incomplete oval shape like as shown on picture.
Step 11: Ears
Draw 2 curved triangles like this.
Step 12: Cheeks and Face
Draw 2 circles on the cheeks and draw on the face.
Step 13: Body and Marks.
Draw the body as same as Sonic's and draw 2 stripes on each side on Pikachu's back.
Step 14: Hands and Tail.
Draw a lightning bolt-shaped tail and draw the hands as shown on picture.
Step 15: Even Cuter.
Add wings to your drawing to make it double chibi.
Now you finished Pikachu!
Step 16: More Drawings Coming Up!
Here are my other drawings which you might like to copy.