Advance Wars/COs

Andy
CO Power: "Hyper Repair", increases all units' HP up by 2 Unlocked by: Default

Max
CO Power: "Max Power", direct fire units get 25% offensive bonus and 1 extra square of movement Unlocked by: Default

Sami
CO Power: "Double Time", infantry units get 30% offensive bonus, 20% defensive bonus, and 1 extra square of movement and lack moving penalties for that turn Unlocked by: Default

Olaf
CO Power: "Blizzard", causes a snow storm for one day, which lowers the enemies' movement range Unlocked by: Default

Grit
CO Power: "Snipe Attack", indirect units get 65% offensive bonus, and 2 range enhancements Unlocked by: Winning the mission "Max Strikes!" with Max

Eagle
CO Power: "Lightning Strike", all units gain an extra turn, except for infantry Unlocked by: Win all Green Earth missions using Sami

Drake
CO Power: "Tsunami", damages all enemy units by 1 HP, unless they were already at 1 HP Unlocked by: Win all Green Earth missions using Andy

Kanbei
CO Power: "Morale Boost", troops receive a 20% offense and defense bonus Unlocked by: Beat Kanbei's three missions in 8 days, 10 days then 12 days in that order

Sonja
CO Power: Increases line of sight Unlocked by: Beat Kanbei's three missions in 8 days, 10 days then 12 days in that order, and then win the 3 hidden missions against Sonja

Sturm
CO Power: "Meteor Strike" Sends a meteor crashing into the area with the highest concentration of enemy troops, damaging by up to 4 HP Unlocked by: Unlocking every other CO

Nell
CO Power: Unlocked by: Finish the advance campaign