Don't want to alter these two pages' titles without your knowledge, so I'll give you the two pages I'm considering renaming, what I'd be adding to them, and my reasoning for them:
Dark Buu - Dark Buu (SSJJ): another Dark Buu exists of a similar title, so this would be to show the differentiation between the two via the user name (which would also be done with the other aforementioned Dark Buu page)
Dark Kakarrot - Dark Kakarot (Chapter): it is nearly identical to Dark Kakarot, a character page, so it would be to avoid confusion.
I won't go through with either unless you're okay with these.
I shouldn't be text as soon as I get outta bed otherwise my comments seem rude like my previous reply. However, I'm okay with you moving pages to page (username or series name) but I just wanted to point out that you could probably either edit all subsequent articles that link to it or simply leave redirect.