Tips

Since his body, beast and bird all use unique shader parameters, you will want to set up multiple substance files for this guy! Substance shader parameters are set per scene, not object. 

The Beast's specular base is very high! Mind the specular values!

Item Slots / Budgets

Head

LoD0 Triangle Limit: 900
LoD1 Triangle Limit: 500
Texture Size: 256H x 256W

Shoulders

LoD0 Triangle Limit: 400
LoD1 Triangle Limit: 300
Texture Size: 256H x 256W

Arms

LoD0 Triangle Limit: 550
LoD1 Triangle Limit: 350
Texture Size: 128H x 256W

Weapon

LoD0 Triangle Limit: 600
LoD1 Triangle Limit: 450
Texture Size: 256H x 256W

Belt

LoD0 Triangle Limit: 650
LoD1 Triangle Limit: 350
Texture Size: 128H x 256W

Bird (Ability 2)

LoD0 Triangle Limit: 1000
LoD1 Triangle Limit: 1000
Texture Size: 256H x 256W

Beast (Summon)

LoD0 Triangle Limit: 4000
LoD1 Triangle Limit: 2000
Texture Size: 512H x 512W

Shader Parameters

Body

Gloss: 32
Specular Scale: 4
Specular Color: [1,1, 1]
Rim Light Scale: 1
Rim Light Color: [1, 1, 1]
Diffuse Warp: default

Bird (Ability 2)

Gloss: 8
Specular Scale: 3
Specular Color: [1,1, 1]
Rim Light Scale: .1
Rim Light Color: [1, 1, 1]
Diffuse Warp: default

Beast (summon)

Gloss: 6
Specular Scale: 22
Specular Color: [1,1, 1]
Rim Light Scale: .3
Rim Light Color: [1, 1, 1]
Diffuse Warp: default

Resources

Character Sheet

Credit: Spudnik

Reference Model

Valve Assets

Decompiled Model

Source 1

 Accepted Sets

Gamepedia

Submitted Sets

Steam Workshop