A number of recipes call for diced apple or pear, which I think would be fantastic here — I simply omitted (in a rare instance of self-restraint) because my salad was a little busy already. Aeri’s Kitchen calls for some lemon-lime soda or Korean drinking yogurt to add that bit of tartness, which sounds amazing, too.
I like Kewpie mayonnaise for its slightly sweeter and tangier flavor, but you can, of course, simply use regular mayonnaise in its place. For a lighter alternative, replace half the mayonnaise with Greek yogurt.