If "allie" refers to a friend or supporter:
* Enemy
* Opponent
* Adversary
* Foe
* Nemesis
* Antagonist
* Detractor
If "allie" refers to a person who helps or assists:
* Saboteur
* Betrayer
* Traitor
* Obstructionist
* Opponent (in the sense of someone who works against you)
If "allie" refers to a person who shares similar beliefs or values:
* Adversary (someone who opposes your beliefs)
* Opponent
* Enemy
* Disbeliever
The best word to use will depend on the specific context.
It's also worth noting that the word "allie" is not a standard English word. It's likely a misspelling of "ally."