When Emma Frost was a member of the Hellfire Club and a villain, her enemies were the X-men and any associated members or teams. After her switch to the "good side" and she joined the X-men, her enemies became the same as the X-men's.

Storm has many enemies from being a part of the X-men, but a couple of her main enemies were the Shadow King and the Phoenix Force.

There is a never ending list of X-men. The list is far too big to put here, but you can find a full list at wikipedia.org and marvel.wikia.com.

Juggernaut's enemies in the Marvel universe include X-Men members like Professor X, Wolverine, and Colossus, as well as other heroes like Spider-Man, Hulk, and Thor. He has also clashed with villains like the Abomination and Thanos.

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