Standard Evil Organization Squad

This is a generally villainous organization with mysterious goals and many distinct characters, usually wearing theme outfits. May start out as an Omniscient Council of Vagueness before getting more time in the spotlight. Unlike a Legion of Doom, they're generally introduced as a bunch of new characters, rather than being a new alliance of old foes. Larger than a Quirky Miniboss Squad, and treated much more seriously (less quirk, more Boss). While they may have access to or be associated with a Nebulous Evil Organization, they are generally not nebulous, but rather have a set number of members, though they may qualify if their influence is nebulous or if they have numerous underlings who do not qualify as full members. They also tend to become a Spotlight-Stealing Squad.

The Standard Evil Organization Squad generally serves as either the Big Bad or Co-Dragons on a large scale (or both, since the leader is often the true Big Bad), and thus are generally a major threat.

Anime & Manga

 * The Espada from Bleach (though they are technically a rank within an evil army, not a group in their own right). The Gotei 13 qualify as a version that pulled a Heel Face Turn, though they technically weren't evil in the first place.
 * The Homunculi from Fullmetal Alchemist.
 * The Innovators are portrayed this way in Mobile Suit Gundam 00.
 * The One Shadow Nine Fists from History's Mightiest Disciple Kenichi.
 * The Akatsuki from Naruto.
 * The Devils of Kimon from Ninja Scroll.
 * One Piece: Baroque Works is missing only standardized outfits. Like Akatsuki, they work in pairs, in each case, a guy and a girl, with the guys numbered a la the Espada.
 * The Cipher Pol 9 two sagas later also qualify.
 * The Juppongatana from Rurouni Kenshin
 * The Numbers in Magical Girl Lyrical Nanoha StrikerS.
 * The Dark Signers of Yu-Gi-Oh! 5D's.

Comic Books

 * The Seven Evil Exes from Scott Pilgrim. Though they lack standardized uniforms or any sort of theme among them, they are introduced one-by-one, . They even fall under !
 * The Hellfire Club from the famous Dark Phoenix Saga of X-Men, all with fabulous clothing.

Literature

 * Scorpia from Alex Rider. They may qualify as a Nebulous Evil Organization, but they don't seem to have too many members.
 * They have hundreds if not thousands of members, but the leadership is a council of the worlds most notorious spies, assassins, criminals and terrorists who play this straight.
 * Though framed as a Nebulous Evil Organization in-story, the Death Eaters (basically the Ku Klux Klan with magic powers) from Harry Potter arguably qualify.
 * The Forsaken from The Wheel of Time fit this to a T.

Newspaper Comics

 * The Hateocracy from The Boondocks.

Video Games

 * The pictured Organization XIII from Kingdom Hearts. They were an Omniscient Council of Vagueness in their debut game, Chain of Memories, but in Kingdom Hearts II and 358/2 Days, they became this (particularly in the latter game, as they were featured as the protagonists there and got much more screentime as a result.)
 * Those from the Past from The King of Fighters.
 * Pokémon has almost one per game, usually based off of a real-life organization. To name a few: Team Rocket, Team Aqua/Magma, Team Galactic, Team Plasma, Team Flare...

Webcomics

 * Homestuck has two. The first is the canonical Trolls, a group of twelve aliens (or so they claim) whose T-shirts follow an Astrological theme (each bears the symbol of one of the Astrological signs). Following the format of Homestuck, they are introduced one-by-one.
 * The second group is from the Show Within a Show The Midnight Crew. The primary antagonists of the series are The Felt, who are a group of 15 time-travelers with a billiard-ball theme (each character corresponds to a ball).
 * The Midnight Crew itself could count, if not for the fact that the group consists only of four people.

Western Animation

 * The Legion Ex Machina from Big Guy and Rusty The Boy Robot.
 * The Pack from Generator Rex straddle the line between this and a serious Quirky Miniboss Squad.
 * While the membership of Young Justice's The Light would form a Legion of Doom in most other continuities, they way the overarching plot is structured makes them this trope, after half a season as an Omniscient Council of Vagueness.