When it comes to finding synonyms for the phrase "helpful ally," there are plenty of options to choose from. Some of the most commonly used synonyms include "supportive friend," "reliable companion," "dependable partner," and "trustworthy associate." Other possible alternatives might include "valuable ally," "useful colleague," "dedicated teammate," "indispensable partner," and "loyal confidant." Ultimately, the best synonym for "helpful ally" will depend on the specific context and situation in which the term is being used, as well as the connotations that the speaker or writer wishes to convey.