If I had control over the 90s anime and whatever possible future continuations I would have Ami get with Urawa, Rei with Yuuichirou, Makoto with Asanuma (I loved their manga storyline and I liked him with her over Shinozaki so I would basically have them interact and get together based off their time together in the Black Moon arc manga, I actually put him with Tomoko Takase from SuperS though) and Minako with Ace (I would also do a Codename Sailor V adaptation for the 90s anime and eventually bring back Ace as a love interest for Minako I would probably tweak the ending of Codename Sailor V from the manga as well) I also thought that Professor Tomoe would be a good love interest for Setsuna. I know they never interacted but I thought it would be sweet. I had this idea of Haruka, Michiru and Setsuna all moving in with Souichi and helping him raise Hotaru and then eventually Setsuna and Souichi would warm up to each other and get together. As for Hotaru I honestly think it would be cool if she got with Perle. If I had done SuperS I would have had the Outers to come back and get their Super forms in that season and as for the movie I would have had Hotaru to have the romance with Perle not Chibiusa who should be with Helios.
I would also have these guys to become regular characters.
I would also love if the 90s anime had done their own version of Hina Kusaka whom I would make a regular character and Sailor Sun.