Or maybe just a *good* one. If it can do such characters well then good. But shoehorning diversity without actually having a good base is just counterproductive.
The franchise you are looking for is Animorphs. Still can't believe that franchise hasn't been brought back. Diverse (mix of male and female characters, black girl, latino guy), an interracial couple, Marco is confirmed by one of the authors to be bisexual, and the character of Tobias is something of a trans parable. It was also massively popular back in the 90s.
There are talks about making a TV series (books are far too large for a movie)
Also some of the transformations were genuinely gross and disturbing