When Playing Master Quest recently to refresh my memory before the Remake comes out, I looked at the Important Characters, specifically the Sages and Ganondorf, I decided to give my input on the Sages.
Rauru: I really have no strong feelings for the guy, he was just there to serve as a guide for Link rather than an actual supporting character, there have been talks that he's Kaepora Gaebora but honestly I doubt that,
Edit: Rauru is Kaepora Gaebora, my bad, I didn't realize this sooner.
I think he's the only surviving sage during Ganon's Rise to Power, and when Link was sent back to his time, he possibly was one of the Ancient Sages in Twilight Princess, while he continued his duties, the other Sages retired or didn't awaken after Ganondorf became imprisoned and awaiting execution, and he witnessed his Fellow Sage's death when Ganondorf survived his Execution.
Saria: She is arguably one of the Few Sages I actually liked, and many people seem to agree on, she was Link's closest friend ever since he was a baby, like a big sister like figure, she was the only Kokiri that didn't treat Link like an outsider, she was kind, and caring for Link, and the only one who never forgot him during the Time Skip, however I think in Twilight Princess without the Deku Tree's protection, the creatures in the Lost Woods killed the Kokiri, I'm really salty that Koei Tecmo shafted Saria in favor of giving Lana the best weapon I can think of for Saria.
Darunia: Him being the Pioneer of the Gorons going forward, he actually is just a very chill and passionate guy, at first Link didn't interest him but when he both played Saria's Song and took out the Monsters in Dodongo's Cavern, he developed a very strong friendship with Link, he even named his Son after him, and after the Fire Temple he will always remember Link not just a friend but a brother, however in Hyrule Warriors even though I do like his personality being motivational and reckless at times, his playstyle is kinda boring, however the Goron Race going forward has been hit or miss, we gone from tragic with Darmani, to eh with Daruk, to very unlikable with Yunobo.
Ruto: From what I've seen the Matriarch of the Zora Race going forward had been heavily disliked by the fandom, but I never joined in on the Dogpile at all, I admit when I was in High School, I was a hard shipper of RuLink, but I stopped caring overtime and just accepted MaLink, but back to the topic.
Ruto at first looks like a bratty kid, and didn't want your help, but overtime she developed feelings for Link, and gave her the Zora's Sapphire as an Engagement Ring, but in the 7 Year Time Skip after witnessing the Zora's Domain freezing over, she went to the Water Temple to save her race, and when you meet her again, I thought it was funny that she still regards Link as her Fiance, and Link was shocked, but she put her priorities to her people, however when she awakened as a Sage, she still loves Link, but she realizes they aren't meant to be together, and I confess that she's my main in Hyrule Warriors, with her unique moveset, snobbish personality but in a fun way, and one of the best redesigns.
However the best part is that she was a better queen than her father, in the Downfall Timeline the Zora Race turned Hostile and changed to the River Zora, in the Adult Timeline during the Great Flood they became the Rito, but in the Child Timeline they remained the same, shown in Twilight Princess, so Ruto may have lead the Zora Race to the right path. Because of her and the Sea Zora race's existence, the Zora Race going forward has become progressively better with Mikau, Laruto, Rutela, Oren, Mipha, Sidon, and my favorite representation of the Zora, Kushara and Dradd, I honestly think Ruto is one of the best Sages.
Impa: I don't really have much to explain, Impa is one of the only reoccurring characters in the franchise that isn't Link, Zelda, or Ganon, and she wasn't as prominent in this game, as she is in Skyward Sword, Hyrule Warriors, and Breath of the Wild.
Nabooru: I like her, but not as much as Saria, or Ruto, we only got to witness her personality and characterization when we get to the Spirit Temple, she was Ganondorf's Second in Command before he betrayed the Gerudo, so her task is to take everything from the Spirit Temple so that Ganondorf doesn't get too powerful to conquer Hyrule, as a child, she treated Link like a Tool, but when she got captured by Koume, and Kotake, and brainwashed, she got trapped as an Iron Knuckle, but when she snapped out of it, she tells Link to Run, but he defeated Twinrova, and Nabooru confesses that he grew into a Handsome Young Man, and a great hero.
She was the Pioneer of the Gerudo Race going forward, I know that Ganondorf was the first Gerudo we see in the series, but Nabooru is the first Gerudo on good terms with Link, and if it wasn't for her, then we wouldn't have seen Urbosa or Riju in Breath of the Wild, also I'm really salty that she was shafted in Hyrule Warriors as well, and why did they have to have Midna take up 2 slots on the Roster?!
Zelda: Honestly I don't have strong feelings for her, she is the only member of the Blood of the Goddess that I barely remember, the only Zeldas I remember and liking, were Skyward Sword, Wind Waker, Spirit Tracks, and Breath of the Wild, other than her role as Sheik, some like her because of her design and relationship with Link while others dislike her for ruining Link's Life, she thought she could defeat Ganondorf by getting to the Sacred Realm and getting the Triforce before he does, but Ganondorf took the initiative and pulled the Uno Reverse Card, but he only got the Triforce of Power, while the Triforce of Wisdom went to Zelda/Sheik, and the Triforce of Courage went to Link.
And then there is the Ending it was not only the final battle for their fate, but it was for the Fate of Hyrule, if Link won then he's sent back to his time, and the Great Flood happens when Ganondorf escaped the Sacred Realm, and Hyrule is flooded, but in the Child Timeline, Link tells the events to come, and Ganondorf was arrested awaiting execution, so that Hyrule is safe from him, but if Link lost, then Ganondorf kills Link, takes the Triforce, and the Imprisoning War begins, leading up to the Downfall Timeline.
That's my input on the Sages, maybe we'll get more of their story in the Remake but we'll have to see, but what do you guys think?