If you’re looking for supporting male characters who are objectified in the same way supporting female characters are, then yes, that would be hard to find. But that’s because men aren’t sexually objectified in the same way women are, because the criteria for sexual objectification for women are different than those for men. How many romantic comedies have you seen wherein the male love interest does fulfill the role of the “strong man” by being protective of the female lead, but also is cast as submissive to her in other contexts, whether by losing arguments to her, being the butt of her jokes, or changing in the stereotypical way women like to think they can change men (e.g. taming the “bad boy”). That’s how men tend to be objectified in films marketed to women, because women’s sexual appetites are different than those of men.

I don’t disagree with the definition you quoted, I disagree with how you’ve applied it. As I said in my first comment:

Tbf you can be ogled and not objectified. The difference is that Thor absolutely is portrayed as a complex character with his own agency, or subjectivity.

By that definition, no female main character of a film ever has been objectified.

Having agency is not mutually exclusive with being dehumanized, sexualized, objectified, etc. The fact that Thor is shown in a great light throughout much of his films doesn’t change the fact that he is regularly sexually objectified as well. Wonder Woman was objectified from the start, but that didn’t stop her from also kicking ass. Lara Croft, Charlie’s Angels, Sailor Moon. If you’re going to claim that having agency means a character can’t be objectified, you have to deny that all of those female protagonists were objectified. That’s not in line with my understanding of both that quote you cited and the way I’ve seen the term used throughout my life. I think your emphasis on the word “mere” in the definition you quoted is misplaced. I don’t think the quote’s author meant it as literally as you seem to be taking it.