All over the place! For starters, there are 15 currently active Twilight Sparkle blogs. Notably the blogs that are based on major characters like the Mane Six tend to focus on a particular personality or interpretation.
Ask Hoops and Dumbbell gives the interpretation that the title characters (well, mostly just Dumbbell) were bullies because they were Armored Closet Gays who picked on Rainbow Dash because they felt like "the tomboy who wears rainbows" is an easy target when you're "scared".
Niggertron: Does he truly believe in the low-grade racial stereotypes he's making, or is he just a Mel Brooks-type comedian whose actions and character are based on Affectionate-Stealth Parody?
Ask Twixie Genies, The Reveal that a genie's Thou Shall Not Kill policy regarding wishes only applies to mortals. Not only was this never alluded to before it becomes "convenient" for the Sultan, not only does it cause the series to suffer from the age old "immortals cannot kill mortals but can totally kill fellow immortals" cliche, but it honestly feels like a tacked on Retcon that was done solely for the sake of a "dramatic" Disney Death. What really makes this sting is that since the Sultan's wish was only for Twilight to "disappear", many thought she had simply been teleported away. Nope! Disney Death. Because clearly death is the only way to make a story dramatic or to make the villain seem threatening.
Though it also serves another purpose of presumably explaining how Trixie was able to kill the immortal Sultan in return.
Discorded Whooves will do this so many times, fans become tired of it (mainly the constant moments where Dissy looks like he's getting better only to randomly go back to being Discorded later on).
The participation of Ask the Crusaders in the Vocational Death Cruise. A lot of fans preferred when the Crusaders were answering questions in-character over the darker turn the blog had taken. However, there are also a lot of fans who appreciate the attempt to fit the Crusaders into VDC and are interested in knowing where the blog will be going with this. It helps that the blog will occasionally shift back to answering questions in between events from time to time. Regardless, VDC at this time makes up the vast majority of the content on that blog, giving making it hard to avoid while looking through the blog.
Onyx from Ask Princess Twilight Sparkle. He's either a genuinely terrifying villain who's a good Knight of Cerebus and who Twilight being genuinely afraid of makes sense because he's a serial killer, something she's never faced before or he's cheep and overpowered.
Celestia's Adaptational Villainy in Ask Papillon. The authors self-righteous arrogance and insistence that "this is how Celestia truly is like" when he was called out on this did not help. This ended up being dropped when the blog rebooted. While still in progress, post retcon, Papillon returns peacefully to the hive having successfully made peace with Equestria, implying that things have been changed for the better. Whether or not this works or was a cop out probably depends on which side of the Broken Base you were already on.
Many of the darker blogs also suffer from this as they get older. It doesn't really matter what happens; nothing will ever change. Discorded Whooves is a prime example of constantly pulling off moments of happiness before throwing back into the pessimistic view of the world. Jitters loves to torment his readers.
Despite being a complete Jerkass whose antics include beating Derpy to a pulp (which sent her to the hospital), sleeping with her nurse and her best friend just to spite her, and possibly being an alcoholic, Discord Whooves has both Miss Twilight Sparkle and Laura the Zony in love with him. And they're both aware of his actions. Though to be fair, this probably has more to do with the mods of both blogs being friends in real life with Discord Whoove's mod. This has to led to some to dislike the Miss Twilight Sparkle tumblr (Although the Laura the Zony tumblr seemed to be saved by this), because of these reasons. Also to the fact that despite not being central to the plot of Discorded Whooves, the tumblr has somehow made it's way to Pregnant/Motherly Scootaloo.
Fans will quickly dismiss Molestia's actions as being harmless and just good in fun despite Molly on certain crossovers have kidnapped and implied to have sexually assaulted a Fluffy Pony, chubby pony, or others, and on certain occasions depending on the writing to have genuinely treated and/or abused her guards, most of her friends including her own sister, and others like her own personal sex objects and nothing more without remorse or empathymost of the time.
At the end of Time Out With Doctor Whooves' Halloween special, Discorded Whooves warns the Doctor that Ditzy will abandon him the moment he stops being useful to her. To the casual reader, this is just Dissy being his usual self, but those who know the plot of Discorded Whooves thus far will realize that Dissy is speaking from his own experiences with his version of Ditzy.
Ask King Sombra's "musical revolution" becomes a lot less funny when it's revealed that hundreds of innocent ponies and wolves died, and Sombra's sickeningly selfish reaction to the carnage he directly caused.
Discussed in Ask Genie Twilight. Now that Twilight is a Genie, she's naturally going to outlive all her friends except for Spike and the Princesses. This implication is actually fully explored in the tumblr, and Twilight ultimately decides eternal life will be workable since she'll always have Spike, at least.
Discorded Whooves. He's a womanizing, alcoholic, sarcastic and physically abusive asshole, but as the story unfolds and we see into his mindset (mainly how he's filled to the brim with deep self-loathing, and his attitude is essentially his way of coping with a world that, in his Discorded mind, has abandoned him), and you can't help but pity him.
Twixie Genies Twilight. At first she acts like a Jackass Genie to Trixie, ultimately tricking her into becoming a genie as well...because after a realJackass Genie who turned Twilight into a genie in the first place, she was left alone in the cave it happened in for months and turned Trixie into a genie because she couldn't take the loneliness anymore.
When Chubbie Pinkie Pie fired Chubbie Rainbow Dash out of a cannon, blogs everywhere started having Chubbie Rainbow Dash zoom past their blog's character in the middle of something. Then Bwobbyquest happened, and essentially knocked the meme for six.
Misty the Wonderbolt's hoodie inspired a fair few reactions.
Pictures wishing the mod of Filly Twilight a happy birthday dominated dashboards of tumblr users for days on end.
Any time Lil-Miss-Rarity does more or less anything at all, a Mexican Wave of reactions springs up.
Whereas Discord Whooves seems to be her Spear Counterpart in this regard. Though when you put them together, it's rather clear who the winner is...
Even the MOD of Discord Whooves has been deemed this (as seen here) for being a (possible) bishonen, pansexual, and being very, very open about discussing sexual topics on his mod blog. The fact that he blurs out his face in every pic he posts makes him even more appealing to many.
Dethklop turned down the chance to perform at the RoyalWedding on the grounds that weddings are not metal. It's also why Luna skipped the wedding: she'd only attend if Dethklop played.
Discorded Whooves for some. Some felt the tumblr could have been so much better which Whooves being like The Doctor was in "The Waters of Mars" or "The Snowman", but instead he's written as being a complete Jerkass that seems to have the power to get two mares around his hoof. It doesn't help that when people try to suggest some new ideas to the mod, he reacts negatively.
Miss Twilight Sparkle for some. Because it was originally a stand alone tumblr, some felt the story of her recovery during her suicide attempts was solid. But following the mod's collaborations with Discorded Whooves, the tumblr has become rather despised. It doesn't help that Dissy only makes her get worse, all while in Motherly Scootaloo it gives the idea that she's getting better..
Miss Twilight Sparkle. She's primarily has half of the Dissy fanbase dislike her due to either being irrelevant to the plot of the entire blog, or just not being Derpy. It doesn't help with the unfortunate implications surrounding her character being in love with the Doctor despite how unstable he is (and apparently Not knowing about Derpy) and the creator of the tumblr, Princess Marshmallow is friends with Jitter Bug Jive, leading to some to believe the two characters paired up because of this.