Board Thread:Questions and Answers/@comment-10556445-20151204081712/@comment-995426-20180106164449

Another consideration, this time from Mirage. Raph may actually have an undiagnosed/untreated mental illness, not immediately obvious when he's a teenager, but present even then and worsening with age.

...and not really make any kind of consistent effort to give these characters appreciable depth or grounded character development. And some viewers legitimately fear this because they've seen it happen before to other properties, most notably in comparing Teen Titans with Teen Titans Go!.