Anon I hope I can help you, but please understand I mostly read life series fics and almost exclusively if they include Scar, so like most are scarian. (All relationship tags are in order of the most to least relevant imo)
A Trick Too Accidental to Name (link)
Relationships: Grian & Scar (mostly, Pearl is also there)
Basically, the Watchers think Scar is a devious little guy and they are spying on him and it's mega creeping him out. He also can't get a straight answer from Grian abt wtf is happening. Takes place Season 8. If you like this you should also check out Ad Astra (link) although that leans more life series imo
In Sickness and in Health (link)
Relationships: Grian/Scar
I'm gonna throw up just thinking about this fic. Basically Scar was kidnapped cuz Grian's a superhero and they needed to get to him, but it follows their recovery and the rebirth of the relationship following such a traumatic event. REALLY good. Please read it.
THE DIVORCE OF THE CENTURY (link)
Relationships: Grian/Scar (bg Etho/Bdubs)
If you are ever in the mood for a silly fic this is THE silly fic. It's treated a bit like crack and somehow that's what keeps everything feeling so in character. Genuinely such a delight. Oh uh also the plot is Scar and Grian get divorced. Kinda.
Relationships: Grian/Scar, Scar & Bdubs
I think this is the best hermitcraft/life series superhero fic. And I went through a phase where I read a LOT of them. This fic is pretty slow on updates atm, (a few months in between at least) but there are updates!! And it is SO worth it!! As the author puts it "Scar saves the city’s most dangerous criminal, makes him his roommate, falls in love with him, and then also saves the world with him. In that order, with various setbacks along the way"
someone loved, never known (link)
Relationships: Pearl & Scar, Pearl & Grian, Pearl/Gem, Grian/Scar (also like, every single Hermit makes an appearance)
This fic has SO much to talk about. First of all, the premise is that Pearl has been grieving the loss someone she cannot remember (its Grian), and then she meets Scar and he is also experiencing it. So it mostly focuses on Pearl and Scar building their relationship as they try to discover who is missing from their lives and why. The relationship dynamics in this fic are SO good!!! I cannot stress that enough. I don't want to overwhelm the relationships bit because I'm trying to highlight the most important ones, but Pearl's dynamic with Impulse as well as Tango and Etho is really well done! And I'm struggling on where to place Gem/Pearl in terms of importance since it isn't super relevant to the premise, but it is such a good and natural relationship and uggggh you have to read this fic! As a Pearl & Scar lover is it to DIE for!
Five seems like a good number... so I'm gonna leave it there. I am always open to giving more recommendations and even more open to receiving recs!!