Ok bad R representation is very hard to find considering how most fanfics have gotten his character right off the bat (maybe they relate much??) but when it comes to any mischaracterization, its blatantly obvious the writer probably only got into the fandom and/or have skimmed the book (still currently reading the book my self but the bitch is long, should be fine though after having been straight obsessed for years so hopefully I know enough). Probably also got into it through the movie (which is what I did) but didn't go further than that and went straight to their wattpad. 

also to clarify, there is no hate, I'm merely just presenting mischaracterization and overused tropes and plots, etc. write whatever you want, I can't stop you but maybe this can offer advice for the future.

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R's POV:

"Merde! Fils de pute!" I cried, sinking into my personal abyss of despair. I'm a worthless nothing, I'm not good at anything. No talents whatsoever. Like seriously, all I do is drink wine because the person who wrote me doesn't care that I'm a painter, musician, poet (fuck you Jehan), boxer (fuck you Bahorel), dancer, etc. I'm not talented at all. And although it is canon that I actually think this way, I have no hobbies to pour my grief because wine and brandy and mead and alcohol is my only character trait.  

I have no character whatsoever, my only role is to drink and make comments on how revolution bad and shit. Lol shit. I'm crazy. 

Matelote passed by with a tray of wine in her arms.

"Give me more whine, whore." My anger got the best of me, I threw the bottle at her head, snapping her neck and causing all the wine to spill on the floor. Darn it, my precious wine. Matelote that useless bitch. 

She's not actually dead, but I don't really give a fuck to look. Only wine, wine, wine and- 

Oh, Revolution Daddy's back. 

Apollo kicks down the door, steam spouting from his ears. "Grantaire, you're nothing."

I chuckle throatily, "Yeah, no shit. What do you think I drink away all my problems for?"

I step on to a table, kicking down everything. "I'm shitfaced and you're still hot, EnjolASS."

"Haha, ass. Just like the revolution you're planning." I'm also fucking stupid, like all I do is make stupid jokes all the time and totally did not go to university. I'm not a philosopher or a scholar or whatever, I'm too stupid to come up with complex thoughts like that. Notice how I used stupid 3 times already? Yeah because my vocabulary is as small my dick. And just common sense and understanding is beyond me. I totally did not come up with quotes like 

"Gentlemen, my father always detested me because I could not understand mathematics. I understand only love and liberty."

I'm also hella selfish. Like I did join the revolution for Enjolras but he's the only reason i joined. I only care about him. I'm a cynic and skeptic who keeps to himself except for wanting to bug enjolras. Nobody likes being around me anyway. I'm not a selfless, caring and kind human being who if I had the chance, would literally die for my friends. I have no desirable traits but that's good for Enjoltaire fanfics because apparently my subservience makes great contrast to Enj's character. And if an OC is involved, I'm simple comedic relief and not at all an important figure to the plot.

"WOOOOH YEAH I LOVE WINE. DID I TELL YALL THAT I LOVE WINE??? I DIDNT??? WELL I DO!!" 

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technically a lot of this is canon R, the example I'm trying to give is when writers literally strip him down to the skeptic drunk. Grantaire is beautiful and more talented than yall just saying. Also fanfics who make him an angry drunk?? YALL CAN FUCK OFF. anyways this turned into more so a rant but hope you guys see my point of view