I'd like to preface this by saying i'm in love with the game and have enjoyed every minute put in. Regarding the title. If Saber is willing to humor me, I'd like to see if my lay out of the Chaplain class is similar to what you guys had in mind. 

- Cosmetic progression...he would start out with a judiciar fit with the skull half covered on the bottom and progress to maybe judiciar masked, unmasked, a variation of the vanguard's helm, and then the chaplains helm with the hood and one without? ( I'd go into detail for each of the armor pieces but wanted to stick with a rough idea via the helm ) 

- Weapons... They are restricted to only using a bolt pistol ( sucks i know @players but i know how GW likes lore friendly ), other than that they have the option of a Crozus Arcanum or a Power Sword WITH A TWIST. To save Saber time and resources, you guys could give us new skins for the power sword except make it the flat top that judiciars are equipped with. Saves you the trouble of animating executions for a two handed sword ( what players probably want but a good compromise ) and you guys get to use those resources to finely tune the Crozus Arcanum animations. ( The Crozus should be nearly as lethal as a Thunder Hammer though to compensate for the lack of diversity in weapons ) 

- Abilities/perks...This is kinda what inspired me to make this post at all. I thought about the campaign and how the characters have their respective abilities except Gadriel ( Titus with fury is unique to him so i wont open that can of worms for an argument to include Fury ). Gadriel's shout could be the Chaplain's ability; An AOE shout that knocks back enemies dealing damage AND/OR buffing allies near the Chaplain. For perks you could add a wide variety of customization regarding what the shout does on top of reusing some useful perks other classes are familiar with. Personally I'd give the option for players to decide whether they want the shout to do damage or buff defense and offense for allies within it's radius. Different from the Tactical's Auspex scan but similar to the Bulwark, the only difference is you all have to RALLY TO YOUR CHAPLAIN. 

 I trust Saber and their vision on how this game will look by the time Space Marine 3 is in the works. That being said i wouldn't be surprised if this idea was used by the time season 3-4 comes out. Thank you again though for the amazing game