Three 

Erin

My monster has three eyes sticking up on
Three antennas out of its head.
It is all green. 
It has three blue noses.
It has one blue mouth. 
It has two blue squares on its neck.
It has four red squares on its chest,
three blue crosses on its chest also.
It has six arms and three red triangles on each arm.
In its body it has eight stars.
It has three legs with three circles on each leg.