Finding synonyms for the phrase "the one who" is incredibly useful when trying to add variety and nuance to your writing. Some possible substitutions include "the person who," "the individual who," "the one that," "the one whom," and "the party who." Alternatively, you could use gender-neutral phrases such as "the one in question" or "the person being referenced." In some cases, you might also be able to use more specific descriptors, such as "the driver," "the teacher," or "the chef." By using a range of synonyms for "the one who," you can create clearer, more engaging writing that keeps your readers interested and engaged.