Commanding Officers are what really make the Advance Wars games stand out to me, not just in strategy RPGs, but in the Wars series in general. I've listed all of them below, but for simplicity's sake, I've listed their AW2 D2Ds, or Dual Strike if needed.

Orange Star

Orange Star is the real star of all the countries in Advance Wars, often getting featured the most, and is based off of America. Hatchi was always the shopkeeper, but offically became playable in AW2, and Nell's little sister, Rachel, and Jake were playable in Dual Strike. Hatchi is often implied to be Yuan Delta, not only a CO in Super Famicoms, but the commander on the back of the original Famicom Wars, where he says that he's looking for a successor. Re-Boot Camp also confirmed that Nell and Rachel's mom is Caroline, a CO from Super Famicom Wars who looks nearly identical to Nell.

	D2D	CO Power	Super CO Power	Hit	Miss
Andy	None!	Hyper Repair	Hyper Upgrade	Mechanics	Waking up early
Max	Tank buff, but indirect units are less powerful	Max Force	Max Blast	Weight training	Studying
Sami	Foot soldier buff, can capture properties easier	Double Time	Victory March	Chocolate	Cowards
Nell	Can inflict extra lucky damage in combat. Lucky!	Lucky Star	Lady Luck	Willful students	Downtime
Hachi	10% discount on all units	Barter	Merchant Union	Tea	Medicine
Jake	Bonus firepower on plains	Beat Down	Block Rock	Clubbin'	Easy listening
Rachel	Units healing at bases will heal 3 HP instead of 2 HP	Lucky Lass	Covering Fire	Hard work	Excuses

Blue Moon

Blue Moon is based off of Russia, and is often shown as the rivals to Orange Star, with Olaf and Grit even said to be from Orange Star originally. Colins was introduced in AW2 and his big sister, Sasha, was introduced, both being children of extremely wealthy parents, possibly a nod to Billy Gates, a CO from Super Famicom Wars who also comes from wealthy parents.

	D2D	CO Power	Super CO Power	Hit	Miss
Olaf	Units have normal movement in snow weather, but snow movement in rain weather	Blizzard	Winter Fury	Warm boots	Rain clouds
Grit	Indirect units buffed but direct units are less powerful	Snipe Attack	Super Snipe	Cats	Rats
Colin	20% discount on all units but all units are slightly weaker	Gold Rush	Power of Money	Grit and Olaf	Black Hole
Sasha	Earns an extra 100G per property	Market Crash	War Bonds	Truffles	Pork rinds

Yellow Comet

Yellow Comet, renamed Gold Comet in Re-Boot Camp, is based off of Japan. Kanebi's mentor, Sensei, debuts in AW2, and his friend, Grimm, debuts in Dual Strike. Sensei could be, and is outright stated in the Japanese versions, to be Yamamoto, one of the few COs in Super Famicom Wars to have a scary ability.

	D2D	CO Power	Super CO Power	Hit	Miss
Kanbei	All units are generally more powerful, but are 10% more expensive	Morale Boost	Samurai Spirit	Sonja	Computers
Sonja	Can see more in fog of war and health is hidden to the enemy, increased counterattack, but increased bad luck	Enhanced Vision	Counter Break	Computers	Bugs
Sensei	Foot soldiers and B-Copters are more powerful, but other ground units and naval units are less powerful	Copter Command	Airborne Assult	Lazy, rainy days	Busy malls
Grimm	All units have increased firepower at the cost of reduced defense	Knuckleduster	Haymaker	Donuts	Planning

Green Earth

Green Earth are based off of some European power, with some people saying England and others saying Germany. Jess debuts in AW2 to be the land to Eagle's air and Drake's sea, and Javier debuts in Dual Strike.

	D2D	CO Power	Super CO Power	Hit	Miss
Eagle	Air units are more powerful and consume less fuel, but naval units are less powerful	Lighting Drive	Lighting Strike	Lucky goggles	Swimming
Drake	Naval units are more powerful and have normal movement in rain, but air units are less powerful, and has a random chance to cause rain	Tsunami	Typhoon	The open sea	High places
Jess	All ground vehicle units are more powerful, but all other units are less powerful	Turbo Charge	Overdrive	Danelions	Unfit COs
Javier	Indirect damage is reduced, and COM towers grant a bigger bonus per COM tower.	Tower Shield	Tower of Power	Honor	Retreating

Black Hole

Black Hole are the big bad of the series and are based on the future and otherworldly invaders, and I love these guys. Lash is probably gonna get her own shrine sometime soon because I love her so much. Sturm was the only known Black Hole CO in Advance Wars, until AW2, which introduced Flak, Lash, Adder, and Hawke, and then Sturm promptly died at the end of it. To replace the last batch of Black Hole COs and Sturm in Dual Strike, there was Von Bolt and his Bolt Guard, Jugger, Koal, and Kindle who are three COs who are worse versions of their AW2 counterparts except for Kindle, who is a better Lash.

	D2D	CO Power	Super CO Power	Hit	Miss
Sturm	All units are more powerful and move at 1 cost on all terrain	None!	Meteor Strike	Invasions	Peace
Flak	Increased good and bad luck	Brute Force	Barbaric Blow	Meat	Veggies
Lash	All units (except air units) are more powerful depending on the terrain	Terrain Tactics	Prime Tactics	Getting her way	Not getting it
Adder	None, but has the fastest charging CO power	Sideslip	Sidewinder	His own face	Dirty things
Hawke	All units are more powerful	Black Wave	Black Storm	Black coffee	Incompetence
Jugger	Increased good luck and bad luck	Overclock	System Crash	Energy	Static Electricity
Koal	All units are more powerful on roads	Forced March	Trail of Woe	Proverbs, ramen	Fondue
Kindle	All units are more powerful on properties	Urban Blight	High Society	Anything chic	Anything passe
Von Bolt	All units are more powerful	None!	Ex Machina	Long life	Young 'uns!

So, Black Hole has one more CO that isn't listed above. In the Advance Wars mission "Andy Times two!", it's revealed that Black Hole made a clone of Andy to start trouble. Since this was basically just Andy, the original Advance Wars just used Andy's sprites. Re-Boot Camp, however, went above and beyond, making Clone Andy his own CO, with new sprites and even a unique theme and CO power cutscenes. He's even slightly different from Andy, where he doesn't have Hyper Upgrade when you play him in AW2 mode.