Now that i finished my model I began to add materials to my character. Below are Images of each mesh accompanied by text on what I did for each part.
Helmet
For the helmet i gave the object a leathery colour material which I then broke up with some metal on the edges where there are chips in the helmet.

Helmet plain colour

Helmet with metallic areas.
Eyes
For my eyes i made a simple material of white and black where i coloured the black onto the white base colour to create the inner part of the eye.

Eye material
Belt buckle
For the belt buckle i had 2 seperate materials, an aluminium material for the big square on the belt, and then a black metal texture on the small metal straps holding the belt buckle in.

Belt base square

Buckle rectangle.
Body
For the body of my character i went with multiple approaches, firstly i added a base human skin material to the entire body, this is as most of the mesh itself is skin, except the trousers and boots.

Base colour for body mesh.
I then made a base layer for my boots and trousers, i did this by finding a brown coloured material and painted the entirety of legs and lower torso area.

Body with trousers texture painted on
After this i moved onto the head where I painted red onto the sides of the head, these to mimic burn marks and cuts.

Side of head with blood type material.
For my hand I did the same as this, but covered the entire thing with the red material.

Destroyed hand with material.
Due to substance painter not loading the gas mask of my character, I had to move over to blender to texture it properly.
Tunic
For the tunic I began with a grey base material which would become the main colour of the tunic itself.

Tunic base material
After this I added gold buttons to the button faces on the tunic.

Gold buttons on tunic
I then did the same for the epaulettes.

Gas Mask
For the gas mask I created 2 simple textures, one being a light brown material the other being a matte black material, the first being for the body of the gas mask and the latter being the canister at the front.

Fully textured gas mask.