This a custom robot that I made, it has customisable arms, legs, head, chest plate and leg joint.

Step 1: The Head

For the head you will need:
2x2 brick
2x 2x2 plates
2x2 tile

Step 2: The Arms

The arm is pretty basic and doesn't have many pieces
are:
4 cheese slopes
1x2 plate
1x2 clip
1x2 connecter/joint
Make 2 of these

For the legs you will need:
3x 1x2 plates
1x1 stud
2x 1x1 tiles
1x1 cheese slope
2x 1x2 headlight brick
Make 2 of these

For the chest plate you will need:
1x1 tile
2x 1x1 jumper plate
1x2 plate
1x3 tile

For the body you will need:
3x 2x2 radar dish
2x 1x2 grills
1x1 cylinder
4x 1x1 bricks with studs on one side
2x3 plate
1x2 plate
1x2 radar dish

For this you will need
1x1 brick with handle
1x1 with clip on top
2x 1x2 jumper plates
2x 1x1 studs

For this you will need:
2x 1x1 plate
1x1 tile
2x 1x2 tile
2x3 plate

The final step is putting it together