The only thing I could suggest would be that it has some version of Lead By Example. As for cosmetic, I'd suggest giving it a standard trooper torso would look good ('cause pockets are awesome) and the weapon should be a bit more of a solid color, as it has too much personality, and clashes with Advent being manifactured.

The only thing I'de suggest would be a different color scheme. His blue coloring contrasts a bit with the Red, Black, and White standard Advent Scheme. A light grey or pure white would be good to set him off from the Typical Officer.

I would leave the color scheme as it is, but change the look of the weapon, as the current pattern fits Xcom more than it does Advent(too personalized).

I actually like the blue, but a darker red might fit, or a red and white mix to show that it is a bit of a combo between the Commander and the Shield guy.

I changed my mind on the color scheme.I think that gold details or linings like the Archon has would fit this unit very well, give it an air of authority and superiority since its the strongest and highest ranked of all Advent units.

i would vote for a White Uniform for the Commander

As far as ability:
- Call for reinforcement
- Mark Target
- Pistol w/ a gunslinger skill
with 1x flashbang and 1x smoke grenades

Well, the call reinfircements still seems to clash with the captain's ability to call them as I am still not seeing captains crying out for help like the wimps that they are! :)

Coulour scheme-wise, you could try a royal purple with gold trim; make it very roman centurian-esque.

Also, you could give this guy some kind of AOE buff. Maybe +defence or attack

You can definitely give his weapons a lot of upgrades though, so it feels like Bradford's gun in the new dlc!

Maybe a ability where if you shoot him he will shoot you back and if he miss he has a chance to panic your soldier or sum, and another if you kill the commander you get its body when you autopsy it you get to craft the weapon or maybe a PCs