Cyanide and Happyness characters have a round head, square bodies and sticks for arms and legs.

You already changed the colors, but if you keep the shapes, they will look like them anyway.
Luckily there is more than one way to draw stick figures, they dont even need to be humans.

Of course is not neccesary to go for Peppa Pig style. Maybe if you mix references and give it your personal touch, you will be able to get a stick figure art style that stands out among other stick characters.