Ground forces-

Goombas

Koopas

Chargin' Chuck Brigade

Hammer Bro

Fire Bro

Boomerang Bro

Ice Bro

Sumo Bro

Sledge Bro

Piranha Plants

Shy Guys

Snifits

Wigglers

Spinys

Buzzy Beetles

Chain Chomps

Goomba Towers

Broggy

Big Goombas

Tanookia Goomba

Bullys

Spikes

Red, Green and White Magikoopas

Airship fleet

Bomb-ombs

Lakitus

Paragoombas

ParaKoopas

Parabeetles

Bullet Bills

Big Bullet Bills

Banzai Bills

Flame Chomps

Blue Magikoopas

Aquatic Forces

Cheep cheeps

Bloopers

Dragon eels

Huckit Crabs

Cheep Chomps

Spiky Cheep cheeps

Maw Ray

Rip Van Fish

Undead horde

Dry Bones

Parabones

Boos

Big Boos

Bony Beetles

Bone Piranhas

Peepas

Bomb Boo

Mr I

Bone fish

Bone Goombas

Rocks

Thwomp

Thwimps

Boulder

Whomps

And many more

Generals

King Boo

Kamek

The Elite Trio( Sergeant Guy, corporal  Paraplonk, Private Goomp)

The Elite Captain Quartet

King Goomba and King Bomb Omb

Petey Piranha

Blue shell Koopa (whose name is Blue)

Prince Bully(honestly one of my favorite bosses from 3d world)

The Broodals

Boom boom and Pom Pom

The Koopalings and Jr

And lastly..this from a RWBY and Mario mega crossover so the last general/ Member is

Marine

That's the Koopa troop..next are the rivals