Not the only time, as Wiccan was very obviously created as a male counterpart/teen version/legacy for the Scarlet Witch. But other than that, I can't think of any other cases. Which is quite telling: one didn't stick (and like Sutekh said, was treated in a very sexist way in-universe) and the other one doesn't get a push at all compared to the other legacy characters. And yeah, the fact that Marvel doesn't seem interested in exploring this bothers me, because showing that women can be just as inspiring as role models for men IS an important thing.