I intentionally deleted the categories "Donatello/Michelangelo focused episodes" on Breaking Purple and Repairin' the Baron for not enough confirmation. Because those episodes haven't aired yet, it's unclear if the two episodes will heavily revolve around these characters. Please do not add those categories again until the episodes have aired.
Old Hob's weasels were originally in Category:Antagonists (IDW) because of the main cover art for TMNT #103 which was solicited three months before publication, but the scene it depicted did not actually end up happening in-story, and the weasels ended up not harming anyone but Diamond (who is an antagonist). They only rampaged through a shelter stealing food, but it turned out they were just hungry and confused little kids, so I ended up removing the category after #103 came out.
Sometimes we think there are assumptions about categorization that we can safely infer from limited evidence, but then sometimes we can be proven wrong for reasons we did not foresee. I don't believe it's any fatal mistake to think (and edit) that those episodes are focused on specific characters, and it's very likely that they indeed will be focused on them. But let's wait until those episodes air. We document the facts we have, and not the facts we think we have, and our fellow editors can respectfully help us see flaws in our own logic.
Let's take for example, Breaking Purple. Donnie's parenting skills cause Shelldon to run away? Donnie could actually get a lot of screentime. But it's also remotely possible that he'll only get a few short scenes, and that it'll be much more decisively a Shelldon-focused episode.
Oh, and a helpful too for the future, instead of adding any upcoming episodes into the "Upcoming" category, try this.
At the very top of the page, type out the word upcoming in double brackets (these: ). It is for a template used to inform users on any upcoming things in the TMNT universe, this adding it to the "Upcoming" category. It's much easier that way, because once you remove that template after the product is released, it is automatically removed from said category.