Then we need the base concept of the character: forms and basic shapes.
Use basic brush for this.

Use basic hard edged brush.

NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character

Well that is it about the design.
Now add color to the character.

For this I'm going to use this kind of brush
 
and brush settings.

NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character



NPC - non playable character - enemy character